If your acccountant doesnt ask what the transactions are he is not doing his job, (or she).
A Revenue inspector would certainly ask
Yes, but an accountant is not a Revenue inspector - is there any NEED for him to go over the bank statements if the client can provide him with all the figures?
What I mean is, it's better to do the bookkeeping yourself and just give the accountant the figures relating to the rental properties and what kind of expenditure/income they were - rent received, agent's fees, repairs to boiler, replacement of sofa, insurance, mortgage interest etc etc.
It would take the accountant little time and effort to put these figures into the tax return then, hopefully keeping his fee low.
On the other hand, if the accountant has to go over a year's worth of bank accounts, querying everything, in order to prepare the tax return, it will take him a long time and the fee will reflect this, as in OP's case.
I just don't see the point of all this - surely it's not that difficult to just write down any rental income and expenses as they occur, with dates, amounts and descriptions as to what they relate to, and give the list to the accountant together with P60, annual mortgage statements, bank interest statements etc?