Who and Why?
Meet the YesTax Team

At YesTax, we have a very clearly defined idea of the people we want. Our management team combines an abundance of experience in several specialist areas of taxation with a friendly, approachable client service philosophy. Put simply, we’re good people wanting to work with good people. Our staff embody the culture of the firm and we’re very proud of the team we’ve assembled.

John Moxon FCA
Founder and Director


John is an ICAEW Chartered Accountant who holds a justifiable claim to have overseen more R&D tax claims than any other person in the UK. He has solely specialised in this area of tax since 2009 and was a Director at the UK’s first R&D tax consultancy firm. His next role was heading up one of the UK’s largest R&D tax advisory teams. During this time he managed a large client portfolio and ran an enquiry resolution service for accountants who had got into a spot of bother with HMRC with their own R&D claims. John also sits on the HMRC R&D Consultative Committee. His ability to give clear, unambiguous and no nonsense tax advice is popular with his clients – many of whom he has advised for over a decade.

Outside of work, John is a battle-weary Sheffield United season ticket holder, having watched his beloved Blades for over 30 years. In his time, John has also been part of several mountaineering expeditions which have taken him to the Himalayas, Andes and beyond. Ascents of Aconcagua, Kilimanjaro (twice!), Elbrus, Muztagh Ata, Cho Oyu, Mont Blanc and Putha Hiunchuli sit proudly on his mountaineering CV – although his recently acquired status as a dad means he has temporarily hung up his crampons and ice axe!

Find out more about John

Mark Wood FCCA


Mark is a Fellow of the Association of Chartered Certified Accountants having qualified in 2010. He has specialised in R&D tax relief since 2010 and to date has presided over no fewer than 500 successful claims, saving his clients tens of millions of pounds in the form of corporation tax relief and R&D tax credits.

As well as R&D tax relief Mark specialises in two further areas of tax relief: Patent Box and Video Games, both since their introduction into the UK corporation tax framework in 2013 and 2014 respectively. One of the first Patent Box claims made by a UK company was prepared by Mark, and to date, several million pounds worth of corporation tax relief has been saved across both of the above schemes under his guidance.

Outside of work Mark enjoys both playing and watching football, although as a Coventry City fan most of the enjoyment tends to come from the playing side of things! He is also a keen runner, having completed many 10Ks and half marathons over the years. A lifetime ambition was realised by Mark in early 2019 as he completed the London Marathon. Mark is a member of Mensa and currently learning Spanish as second language (very gradually). Any spare time is spent trying to entertain his twin daughters!

Find out more about Mark

Hayley Kemp


Hayley has worked within the accountancy and tax industry since 2004, specialising solely in R&D tax relief for the past six years. Hayley’s most recent post was heading up the Incentives and Reliefs Tax Division for one of the UK’s largest tax consultancy firms. During this time, Hayley handled a vast number of successful claims in a wide range of sectors such as software, engineering, defence and cosmetics. She has also worked closely with numerous accountancy firms to develop seamless partnerships in providing specialist tax services to their clients.

Outside of work, Hayley is kept very busy chasing around after her young daughter. She is also a passionate cook and loves to try out new recipes on her willing husband when she has the time. Hayley is also a member at her local gym -should she ever decide to go!

Find out more about Hayley

Natalia Pope BA (HONS), MA Law


Natalia qualified as a commercial property lawyer in 2009 and spent 7 years in practice specialising in both freehold and leasehold sales and acquisitions. In 2014, critical changes to the capital allowances legislation were made and it became crucial for parties to pool and transfer available allowances at the time of the legal transaction. Keen to secure these valuable tax savings for her clients, Natalia turned her focus solely to this area. Since then she has worked exclusively with tax advisers and accountants, specialising in incentives and reliefs to secure valuable tax savings for her clients. Natalia’s excellence in this area ensures clients act at the right time, and not only protect, but maximise their tax saving opportunities. Versed in all aspects of R&D and Capital Allowances tax legislation, Natalia will quickly assess the potential and scope for a claim. She is easy to work with and her energetic and friendly personality make her an extremely popular member of the team – she is loved by all that meet her!

Outside of work, Natalia loves the great outdoors and enjoys walking, running, netball and tennis. Natalia is most frequently found on the netball court, where she still plays competitively in the top division of the Sheffield league, and enjoys a play maker role in centre court!

Find out more about Natalia

Rachael Hart
R&D Tax Manager


Rachael qualified as a taxation technician in 2003, working in the tax and accounting field, both in practice and in industry in the early part of her career. In 2011 Rachael became an R&D tax relief specialist at the UK’s first R&D tax advisory firm and has submitted over 400 successful claims. Rachael has developed a specialism where software R&D claims are concerned, most notably in the travel agency sector. She has an excellent understanding of the issues facing software development companies – many of which have used Rachael for R&D tax advice for nearly a decade.

Outside of work Rachael spends most of her time running around after her two young children! When she gets a moment to herself, Rachael is also a keen runner who has taken part in the Sheffield Half Marathon twice and has participated in various 5K and 10K races.  Additionally, Rachael has a keen interest in identifying the best place for afternoon tea and has sampled numerous venues over the past few years. She is always on the lookout for recommendations!

Find out more about Rachael

Callum Byers ACA CTA
Head of Capital Allowances


Cal graduated from the University of Sheffield in 2014 achieving a 2:1 (BSc) in Mathematics and is a Chartered Tax Adviser (CIOT) and Chartered Accountant (ICAEW).

Having spent 6 years specialising in capital allowances claims at a Big 4 practice, his experience in this area of taxation is vast. Cal has advised a wide range of businesses operating in a variety of sectors, including supermarkets, retailers, leisure chains, hospitality, manufacturing/industrial and aviation. He has an excellent understanding of the regularly shifting capital allowances legislative landscape and is well-versed in advising on multi-million pound capital allowance claims

Following his time at University and prior to his career in tax, Cal worked briefly as an operational manager for Royal Mail, responsible for managing and coordinating a team of c.20 staff as a key part of the sorting and delivery pipeline.

Outside of work Cal is a keen snowboarder and runner, and will rarely miss watching the Formula 1 on a Sunday afternoon. He is always on the lookout for the next sci-fi, fantasy or historical fiction audiobook to keep him company on his commute to the office!

Find out more about Callum

Holly Young ACCA
Senior R&D Tax Consultant


Holly has specialised in R&D tax relief since June 2015, having been involved in the submission of hundreds of claims (400+). She has wide-ranging knowledge on all aspects of preparing a successful claim and has worked with companies across a wide range of sectors.

Holly started her career working for her family business and thus is highly passionate about helping other SMEs. She has a strong accounting background having achieved a 1st class degree, then going on to complete her ACCA qualification in 2017. As a result of her passion for the subject, she achieved two ACCA prizes. Prior to specialising in tax, Holly worked as an accountant in a medium-sized practice.

Outside of work Holly enjoys spending time with her friends and family, eating out and walking. She is also a keen beekeeper and loves her weekly netball and Zumba sessions.

Find out more about Holly

Chris Norris ATT
Senior R&D Tax Consultant


Chris has solely specialised in R&D tax relief since 2014, having left University with a degree in Financial Mathematics. Chris worked his way up from Tax Assistant to Consultant and opted to join YesTax in the summer of 2020. Chris is now a Senior Consultant, providing his expanding client base with sound R&D advice and support. Chris takes a keen interest in complex legislative issues and is regularly found studying the CIRD manual! During his time working in the R&D tax sector, Chris also qualified as a Taxation Technician (ATT).

Outside of the office, Chris’s main interests involve keeping himself active, more often than not on the football pitch. He also loves his golf, running and road cycling (sorry drivers!). His biggest sporting achievement to date was his completion of the Paris Marathon in 2019 where he was able to raise money for both MIND and Sheffield’s local Samaritans Centre.

Having recently taken a keen interest in the armed forces (but not wanting to live the military lifestyle), Chris hopes to join the RAF reserves in the near future to fit in around his R&D career.

Find out more about Chris

Sophie Marshall
R&D Tax Consultant


Sophie studied A-Levels in her hometown of Dronfield before plans to move away to university were thrown up in the air when she discovered she was to become a big sister (again) – however this time there was a 19-year age gap! She decided to stay local, help out with baby brother, as well as opting to learn and work at the same time.

Sophie’s accountancy and tax career began at two Sheffield-based practices where she also completed her ACCA studies. After pondering which area of the profession suited her best, Sophie decided that tax was the sector she enjoyed the most. Much of her time has been spent working in personal tax, but the lure of specialising in R&D tax relief was too much!

Outside of work, Sophie is a keen runner. She completed the London Marathon in 2017 and again in 2018 (the hottest on record). In completing the race, Sophie raised over £20,000 for The Teenage Cancer Trust following the loss of a childhood friend in 2011. Despite vowing never to run the distance again, she is currently in training for the 2021 London Marathon!

Find out more about Sophie

Megan Blaney
R&D Tax Assistant


Meg graduated from Bangor University in 2017 with a first class honours degree in Accounting and Finance (BSc). Prior to joining YesTax, she spent time travelling around Australia and New Zealand, embarking on a number of outdoor pursuits including skydiving and glacier hiking.

With travelling and student life sadly a distant memory, Meg is very much looking forward to forging a career in specialist tax. She is currently studying for her ATT qualification and has ambitions to one day become a Chartered Tax Adviser. Her role at YesTax involves assisting Consultants and Directors on all aspects of YesTax’s advisory offering and she is working towards building her own client portfolio.

Outside of work, Meg is a big sports fan, notably rugby, cricket, football and as of very recently, ice hockey. Meg supports Wales across a number of sports, with her club loyalties lying with Sheffield Wednesday. Meg wisely chose not to mention this during her interview process. She is also a keen dancer (having completed many exams in this discipline) and loves the outdoors. She is often found exploring the Peak District and Welsh mountains and in 2015 she went a step further by successfully summiting Mt Kilimanjaro.

Find out more about Megan

James Smith


James graduated from the University of York with a degree in Computer Science and has specialised in the field of R&D tax relief since 2019. James’ software industry background has resulted in him being heavily involved in many claims for software companies undertaking a wide range of developments. These includes machine learning and artificial intelligence technologies as well as more traditional types of software development such as backend database integrations. James takes a constant interest in new developments within the software industry, allowing him to understand the way in which these can apply to R&D tax relief claims. James is currently partway through his ATT studies and one day hopes to become a Chartered Tax Adviser.

Outside of the office, James is a keen hockey player and has played since the age of 7. He currently plays for Sheffield University Bankers and is looking forward to a full, uninterrupted season for the first time since moving to Sheffield. As well as hockey, James enjoys the occasional cricket game and is a Blackpool FC fan - so it’s unlikely there will be any office rivalry here!

Find out more about James

Melanie Cheshire
Office Manager


Mel’s working life started in 1984 at PwC where she worked until 2008. Her career was punctuated by career breaks to bring up her two sons, although she also looked after a third child called Alison whilst at work. After a three year stint at a local accountancy firm, she joined Howarth Lynch in 2011 working alongside John, Mark, Hayley, Rachael and Alison. When YesTax came calling in 2019, she didn’t hesitate to follow the old team and continue her close association with the YesTax team members.

At YesTax, Mel is the controlling centrepiece of the office. Her role involves a variety of administrative and secretarial tasks and she is excellent at keeping everyone in check. The few who cross Mel always regret their actions!

In her spare time, Mel’s two grown up sons keep her busy, as do the Sheffield Steelers ice hockey team. Mel travels far and wide following her team, more out of a love for hunky North American men fighting on ice than the game itself. She also keeps fit with regular boxercise classes, but acknowledges that her ripe age is making this more and more difficult!

Find out more about Melanie

Alison Ralston CTA
Chartered Tax Adviser


Alison left university before moving to Birmingham and working and qualifying as a Chartered Tax Adviser with PwC back in 1998. On budget night, back in 1999, new legislation concerning tax relief on R&D expenditure caught her eye - and she has never looked back! Alison went on to build a national R&D tax service at PKF before starting her own business, HowarthLynch, in 2009.

By 2014, Alison’s business was one of the largest bespoke tax practices in the UK. Her ambition was to develop a larger specialist tax practice and be the largest independent tax firm in the UK. To realise this ambition, Alison sold her practice to a Fortune 500 company.

Alison took a break from corporate life in 2018 to pursue her philanthropic pursuits. She is a strategic thinker and motivational leader who likes to lead by example inspiring teams to deliver. She has a proven track record of commercial success - leading, motivating and selling. She uses these skills in the boardroom to make real changes in her frontline charity work.

Alison is the founder and trustee of the Guiding Light Foundation which now runs through the core of YesTax.

Alison’s main area’s of tax specialities are Capital Allowances, R&D Tax Relief and Patent Box.

As well as her family, work and charity commitments, Alison is a keen Sheffield Wednesday supporter which is not echoed by her husband or business colleagues and is the subject of many lively discussions!

Find out more about Alison