Chris Sullivan ACA: the chartered accountant you'll actually deal with
Lumi is a one-to-one chartered practice in Winchester. Every client works directly with Chris Sullivan ACA — an ICAEW Chartered Accountant with over seven years across audit, tax and business acquisitions — not a call centre, and not a different junior every quarter.
Who is behind Lumi Accountancy?
Lumi Accountancy is run by Chris Sullivan ACA, an ICAEW Chartered Accountant (member no. C011009337) and the firm's founder. It's a one-to-one chartered practice at Abbey Mill in Winchester: every client deals directly with Chris, and every credential — ICAEW, Companies House, Xero — can be independently verified.
Last reviewed September 2026
Chris Sullivan ACA
Hi, I'm Chris. I started Lumi because I genuinely believe accountancy should feel less like a chore and more like having someone in your corner who you can ask questions without judgement, with no topics off limits.
I've spent over seven years in the industry, working across audit, accountancy, personal and corporate tax, and supporting businesses through acquisitions and sales. I love the variety; no two clients are the same, and I find that genuinely energising.
What I can't stand? The kind of accountant who files your return, takes their fee, and disappears until next year. That's not Lumi. We're here when you need us.
When I'm not waist-deep in spreadsheets, you'll find me walking Chip and Link (my two dachshunds), cheering on Southampton at St Mary's, or playing football — usually until I get injured.
How to check we are who we say we are
Anyone can call themselves an accountant. "Chartered Accountant" is a protected title. Every claim below is independently verifiable — the links go to the official registers, not to us.
ICAEW Chartered Accountant
Member no. C011009337
Check the ICAEW register →Registered company
Lumi Accountancy Limited, no. 17052646
View on Companies House →
Xero Certified Advisor
Bronze Partner
See Lumi on the Xero directory →
Hampshire Chamber of Commerce
Member
Chamber member directory →
Saints Foundation
Corporate Patron
About the Foundation →Regulatory information: ICAEW, AML supervision, insurance and complaints
Everything a regulated firm is required to make available to you, on one page rather than buried in an engagement letter. If anything here is unclear, ask.
Legal entity
Lumi Accountancy Limited is a private limited company registered in England & Wales, company no. 17052646.
Registered office and trading address: Abbey Mill, Abbey Mill Gardens, Winchester, Hampshire, SO23 9LH.
VAT registration no. GB 515223427.
Professional regulation
Lumi Accountancy Limited is a member firm of the Institute of Chartered Accountants in England and Wales (ICAEW). Chris Sullivan is an ICAEW Chartered Accountant, member no. C011009337 — check the register.
We are bound by the ICAEW Code of Ethics and subject to ICAEW Practice Assurance. Lumi Accountancy Limited is not a registered auditor and does not carry out statutory audit work.
Anti-money laundering
Lumi Accountancy Limited is supervised for anti-money-laundering purposes by ICAEW under the Money Laundering, Terrorist Financing and Transfer of Funds Regulations 2017.
We are required by law to verify the identity of every client before we act, and to keep that information up to date. It's a quick electronic check, and we'll tell you exactly what we need.
Professional indemnity insurance
Our professional indemnity insurer is Hiscox Insurance Company Limited. The policy's territorial coverage is worldwide.
Full policy details are available on request from info@lumiaccountancy.co.uk.
Data protection
Lumi Accountancy Limited is registered with the Information Commissioner's Office, registration no. ZC102242. How we handle your data is set out in our privacy policy.
Terms & complaints
The terms on which we act are set out in the engagement letter you sign before we start, and are available on request at any time.
If something isn't right, tell Chris directly: info@lumiaccountancy.co.uk or 01962 435112. You'll get an acknowledgement within two working days and a full written response within 20. If you're not satisfied with the outcome, you can refer the matter to ICAEW's complaints process.
Published in accordance with the Provision of Services Regulations 2009 and ICAEW's disclosure requirements. Last reviewed September 2026.
What working with Lumi actually looks like
Who will I actually deal with?
Chris, every time. You get one qualified Chartered Accountant who knows your business, not a rotating team and not an offshore processing centre. On the Complete package that includes unlimited phone support.
Are you qualified to give tax advice?
Yes. ACA is the ICAEW's chartered qualification — three years of exams plus supervised practical experience, and ongoing CPD. It's a protected title and membership can be checked on the ICAEW register.
Do you only work with Winchester businesses?
No. Most work happens through Xero, email and video calls, so location isn't a barrier — we work with clients across Hampshire and the wider UK. If you'd rather meet in person, the office is at Abbey Mill in Winchester.
How big a business do you work with?
From newly incorporated companies through to around £10m turnover. Below that we're a good fit; well above it you'd be better served by a larger firm with a bigger team, and we'll say so.
Have a proper conversation before you commit
A free 30-minute call, no obligation. If we're not the right fit we'll tell you honestly and point you somewhere better.