Who We Are
Everything we do starts with you.
More than just numbers
We see accountancy as part of the bigger picture, not a standalone service that ticks boxes once a year.
It’s about understanding how your business really works. What’s driving it, what’s holding it back, and where the opportunities are that might otherwise go unnoticed.
We take the time to get under the surface, so the advice you get isn’t generic, it’s grounded in your business, your goals, and the decisions you’re trying to make.
Because when you truly understand the moving parts, you’re not just reacting to the numbers, you’re using them to shape what comes next.
Market leaders
Technology is transforming the way businesses manage their finances, and we’re proud to be at the forefront of that change.
At Sinclair Day, we embrace the latest developments in cloud accounting, automation and AI-powered technology to create a smoother, more efficient experience for our clients. We work closely with leading software providers and continually seek out innovative solutions that make managing finances simpler, faster and more insightful.
Cloud accounting gives our clients instant access to their financial information, wherever they are, while allowing us to provide proactive support throughout the year. Rather than waiting until year-end to understand your numbers, you’ll have greater visibility, better decision-making tools and the confidence that comes from knowing exactly where your business stands.
By combining modern technology with expert advice, we help our clients spend less time worrying about finances and more time focusing on what they do best.
From the outset, our clients benefit from:
Ongoing Advice
Our relationship doesn’t begin and end with a set of accounts. We take the time to understand your business, your ambitions and what success looks like to you, allowing us to provide advice that is tailored, proactive and genuinely valuable.
Because great accountants don’t just report on the past — they help you shape the future.
Tailored to You
We don’t believe in forcing businesses into pre-built packages. Instead, we create a service around you, selecting the support and services that best fit your business and ambitions.
The result is a flexible, personalised approach where you’re never paying for services you don’t need and always receiving the support that matters most.
Knowledge That Goes Beyond Compliance
Our team brings together technical expertise, commercial understanding and real-world experience to help you make confident decisions. From refining processes to supporting growth, we’re here to provide guidance that adds genuine value to your business.
eCommerce Expertise
From first sale to seven figures, we help ambitious eCommerce businesses stay in control of their finances. We understand the unique challenges of online selling, from multiple sales channels and payment providers to VAT, stock management and profitability.
People First, Always
Behind every great client experience is a great team. Our knowledgeable and approachable experts take the time to understand your business, offering personalised advice, proactive support and the reassurance that there’s always someone in your corner when you need them.
Responsive Support
Questions don’t always arise when it’s convenient. That’s why we’re committed to providing timely, practical support whenever you need it, helping you overcome challenges quickly and keep your business moving forward with confidence.
Built Around Your Ambitions
We take the time to understand what success looks like for you. Whether you’re launching a new venture, growing an established business or planning for the next chapter, our advice is shaped around your goals, not a generic template.
Redefining accountancy
What makes us different from our competitors?
For a start, the only bottom line were focused on is yours.
We don’t use timesheets so there are no unexpected bills at the end of the month. Got a question? Our team responds quickly – in 24 hours in fact. None of this hanging around waiting for an answer.
We like nothing more than a friendly conversation during which we can find out more about you. Explore ways we can save you time and money.
Above all, we want to find out how we can contribute to your success.
Meet the team
We have the skills and experience to provide both you and your business with the advice that you need.
Andrew Sinclair-Day
Founder/Head of Dreams
About Andrew
I love working with businesses and individuals to help them achieve both their business and personal goals. Most of my time is spent working with business owners helping them shape their future and provide them with guidance and support along the way. I firmly believe no dream is too big or unobtainable.
Outside of work, I love travelling, eating out and socialising with friends. I love to read and learn new things which I can then share with my clients.
Samantha Sinclair-Day
Head of Awesomeness
About Samantha
I am passionate about Xero and Dext and love helping our clients understand them and to get the most from them. I love it when clients tell me it’s the best change they have made and that they couldn’t have done it without us. I aim to ensure our clients have an awesome experience with us.
Outside of work, I love travelling, spending time with friends and family and relaxing in the garden with a chilled glass of white wine. I am an active member of the Rotary Club of Worcester and served my year as President in 2016-17.
Charli Sinclair-Day
Chief of Happiness Officer
About Charli
I’m passionate about making Sinclair-Day sparkle online, connecting with people out networking, and generally sprinkling a bit of Sinclair-Day magic wherever I go. I love educating and empowering business owners through our podcast, Call the Accountant, helping to make conversations about numbers feel more approachable and less intimidating.
My goal is for the next generation of business owners to feel happy, confident, and in control when it comes to talking about their finances.
Outside of work, I’m usually planning my next tattoo, binge-watching Doctor Who, shopping, or curled up with my nose in a good book.
Mike Brown
Accounts Wizard
About Mike
I prepare and review the financial statements for our clients, and provide support and assistance to the team on all things accountancy related. Having worked in both accountant and support roles, I particularly enjoy finding solutions to business queries that enable clients to make informed decisions based upon their activities.
In my free time I enjoy spending time with my family, and can often be found in the kitchen or garden. When time allows I am working my way through a movie, game and podcast backlog; this statement will likely be true no matter when you read it.
Stefan Shell
Xero Hero
About Stefan
My work place is the Xero matrix, where I battle bank statements, bills and invoices alike, to bring order from chaos.
I like to spend my downtime at home with my family where I regularly enjoy a good book, a few hours gaming, or listening to some great music, but I am at my happiest with a guitar in my hands.
Olivia Gilks
Payroll Pilot
About Olivia
My role includes completing the bookkeeping and payroll for clients, as well as providing them with any help I can along the way!In my free time I love going to the cinema with friends and discovering new books to read, all while enjoying a glass of iced coffee.
Amber Mansell
Admin Angel
About Amber
As admin angel, I am likely the first voice you’ll hear or face you’ll see at Sinclair Day Accountancy. Whether I am answering your calls or organising your files I will make sure your onboarding is smoother than a fresh jar of peanut butter
My weekends are a dedicated balance of ‘on the go’ and ‘slow it down’ you’ll either find me running for Strava kudos followed by brunch and iced matcha or lost in the crowd at a music festival. That said, nothing beats the simple stuff: family time, a new series and a Friday night take out.
Looking to join our team?
Get in touch with us today.
We’re not currently advertising any positions at Sinclair Day – please check back soon.
Client Testimonials
Boutique accountancy for people with big dreams.
We’re not here to simply file your accounts and send you on your way. We’re here to understand what you’re building, where you’re heading, and what’s important to you.
Our clients choose Sinclair Day because they want more than compliance. They want clarity. Confidence. A trusted team in their corner. They want accountants who care about their goals as much as they do.
The numbers matter, of course. But it’s what those numbers make possible that excites us most.
Here’s what our clients have to say about working with Sinclair Day.
"Love this company, originally met Sam Sinclair-Day and she did indeed make it all sound so easy - as a company we were using the Xero platform but we had some issues we couldn't resolve and Sam and the team took our Sterling accounts from us and have made it so easy for me and the accounts team. They have a great team that are really helpful, we feel we can always pick up the phone and queries are sorted! Thank you and keep doing what you are doing!"
Tracey Davis
Sterling Networks
"Love this company, originally met Sam Sinclair-Day and she did indeed make it all sound so easy - as a company we were using the Xero platform but we had some issues we couldn't resolve and Sam and the team took our Sterling accounts from us and have made it so easy for me and the accounts team. They have a great team that are really helpful, we feel we can always pick up the phone and queries are sorted! Thank you and keep doing what you are doing!"
Tracey Davis
Sterling Networks
"Love this company, originally met Sam Sinclair-Day and she did indeed make it all sound so easy - as a company we were using the Xero platform but we had some issues we couldn't resolve and Sam and the team took our Sterling accounts from us and have made it so easy for me and the accounts team. They have a great team that are really helpful, we feel we can always pick up the phone and queries are sorted! Thank you and keep doing what you are doing!"
Tracey Davis
Sterling Networks
Contact Us
Accounting for ambitious businesses
Your accountant should do more than prepare accounts and meet deadlines. They should help you understand your numbers, make confident decisions and support your long-term ambitions.
At Sinclair Day, we provide tailored accounting, bookkeeping, forecasting and advisory services designed around the needs of your business. No rigid packages. No unnecessary extras. Just the right support, from the right people, at the right time.
We pride ourselves on building lasting relationships with our clients, becoming a trusted part of their team and helping them navigate both opportunities and challenges as they grow.
Because accounting isn’t just about numbers. It’s about what those numbers make possible.