Have googled a little and found a local accounting firm who are ACCA(Accredited?)
Phoned them - Feels a little awkward explaining the situation and what I think I'm in need of, but maybe they are used to it.

Accounting Manager was friendly to speak to.

Initial estimate for a small business could be around GBP 350.
They need more details emailed to them, example of my transaction ledger and invoices, to get a better idea of how much needs to be reviewed.

kb