I am sorry, but whilst agreeing with you that you are paying through the nose service, as I am now retired I am not completely in touch with this market. Presumably he does your Annual Report and Accounts ?
However, I would have thought that if you shop around package with other professionals, you could get this service 10K plus VAT. My original suggestion was based on merely doing the tax return as the figures would have to be waded through before he could make the return. Your additional question has opened another door. Personally I wouldn't stand a rip off and would change professionals as soon as convenient.
Mark you I was horrified at the price charged by a local firm to prepare final accounts from a Sage package which does it all anyway. Any competent apprentice could have completed it in a couple of hours and the bill was astronomic.