Hi, I am a hiring manager in finance and yes, there is all sorts of discrimination out there but also all sorts of fantastic employers and teams. You just have to write that CV and go out there and hunt!
The biggest prejudice about older employees you are likely to face are that you will lack energy, be slow, and learning/agility or adaptability, and that you may not cope with new systems, or be more likely to suffer from ill health. You can counter this in your cv. Include a short personal statement at the beginning which describes in one sentence what you aware like and in the second sentence what kind of role you want next.
Your cv experience will speak for itself hopefully. Focus on skills and outcomes rather than just listing what you’ve done like a series of job descriptions. Make sure you list accounting systems you have used recently and thoroughly - if you used Quickbooks 30 years ago don’t mention it! And state your level in Excel eg “Iintermediate Excel (pivots, Xlookups etc)”. For your qualifications I would list AAT Qualification (don’t put the date), A levels, degree (if any) and stop there.
Don’t mention O levels in your cv as it ages you - if you have AAT and a strong track record at work, it’s implicit that you can cope with enough math and English to do your job. There are SO many foreign candidates with meaningless qualifications that when I’m hiring I barely glance at school qualifications nowadays.
Also do NOT feel the need to list every job you ever had. As an employer Im interested in what you can do for ME not where you’ve been for 38 years and I don’t want 10 pages to read. Give me 10 years of detailed, high quality job experience, and prior to that simplify and skip. If you spent the first 15 years pottering in around in junior clerking roles just leave the first 15 years off your cv altogether!
What was your experience during Covid - can you talk positively about what you did to handle the sudden switch to remote-working and ensured stability and continuity in your function?
If your current job looks simple then make sure the earlier jobs on your cv make it very clear what other skills you may have eg writing standard operating procedures, bank reconciliation, supervising juniors, month-end close, reporting and reconciliation, accruals and prepayments, systems change. Your reason for leaving is “looking for a more stimulating role as my skills are currently under-utilised” so it is fine if your current job looks stale - just supports why you’re leaving it! Be prepared to answer in interview why you haven’t sought internal progression.
i just did a search on Indeed website for “Accounts Payable” /Greater London and filtered on remote jobs and a great role at Kroo in Holborn came up - it would be perfect for you.
You have AAT qualification under your belt don’t make a big deal about it lapsing on your CV. Put AAT qualification on your CV, it’s fine. Meanwhile you could apply to rejoin AAT - it’s not difficult to do so. If you need CPD hours then a lot of that can be done online if you haven’t had relevant training at work.
I hope this helps OP as I truly believe it is VERY possible to have a fabulous “second career” in London! My dad this (engineering) age 55 and commuted 3 days a week until he was 70 as he LOVED it. Wishing you luck.