This may have changed so you will need to check it:
Quite a few years ago, a small business that was turning over £15k or less did not have to submit detailed accounts. All they had to submit was: Turnover and expenses totals. e.g. Turnover £14,727. Expenses £4,805. If you're still allowed to do this and decide to do it this way, I suggest that you still keep a record of your income details and expenses receipts for the last 7 years (6 years plus the one you're currently working) - just in case they decide to check you out.
EDIT: Also be aware that there may be a class 2 NI liability (class 4 unlikely at that profit level but check anyway as I'm not an accountant).