What goes into annual accounts?
For a limited company, the accounts cover the accounting period ending on the company's accounting reference date. The profit and loss account summarises the year's trading; the balance sheet is the position on the last day; the notes explain the accounting policies and the figures that need it.
Small companies file a reduced version at Companies House — micro-entity or small-company accounts — which leaves out the profit and loss. The full accounts still have to be prepared for the shareholders and for HMRC, where they accompany the corporation tax return.
The accounts are not a separate exercise from the bookkeeping. They are the bookkeeping, summarised and adjusted for accruals, prepayments, depreciation and anything else the year-end requires. If the ledger is clean, the accounts are mostly already written.