thanks but still i don't have answer how to put bitcoins in accounting
converting bitcoins to gbp have no point for me
The same way you'd use any other currency. If your business accepts payments in let's say USD, EUR and GDP, then you'd have at least 3 accounts in your books. One for each currency. If you want to start issuing invoices denominated in BTC, you'd simply add an account for that currency.
Do a search for "multiple currency accounting" or ask your accountant. He may not be familiar with bitcoin, but handling multiple currencies shouldn't be problem for him.