I'm sure mny accountants will tell you a rough figure so you ain't thinking you're getting ripped off. My accountant charges a mate £500 to do his books and go through his numbers.
I reckon you would be better paying a personal visit with your accounts all in order and receipts stapled together in monthly sequences.
If you are using george it should all be there for them on 2 sheets of paper.
I was expecting to pay a couple of hundred for my accountant but he only charged me £40 each time the last 4 years.
If you have your paperwork in order, stapled together etc then it probably wouldn't take them more than 1/2 an hour.
If you have neat accounts all they need to do is look at your profit/loss account and expenses, add on other things to your expenses which you haven't claimed for and then add it up and print off.
1/2 hours work for my accountant.
Though i don't have an empire for him to go through.