"3 tax returns plus a small company statement (company is trustee of the trust for protection) saying that the business did not trade during the year, it just sits there"
yours and your wife's tax returns shouldn't take much time to prepare. That trustee company, seeing it did not trade, shouldn't take much time to prepare too, probably just a standard P&L, Balance Sheet, minutes, etc.
It is within your right to ask for a breakdown of the fee.
