Bookkeeping for 3 small companies

General information for the business: we use quickbooks
Accounting software: Quickbooks
Description of support work: as I mentioned above , there is no more than 4 hours weekly to be done
Extra notes: I am looking for bookkeeper to help me out with my 3 small businesses.
we used to have a bookkeeper who did 4 hours a week, who said that was plenty.
We are based in London, I guess most of the work can be done offline, however would be nice if the bookkeeper could be in charge of the filing too