For a small business, sole trader it is important that you maintain good bookkeeping and accounting.
Using a bookkeeper will free up your time to concentrate and grow your business.
Using a bookkeeper will ultimately save you money on Accountancy fees as your accounts at year end will be correct, up to date, meeting government requirements.
Using a bookkeeper gives you regular contact with some-one who understands your business and can deal with queries/questions as they arise, not just at year end.
For a Sole Trader a good bookkeeper is all you need to assist you with the A-Z of your accounting needs.