Its one of them jobs that you do for a friend as a "Favour" but eventually realise you should never have got involved he wants to sell the house but cant so now needs to rent it out, the decision i have decided to take is to (as the boiler is already fitted before he told me that he can no longer afford the zoning) is i am going to fill in the bench mark and let them no it is not up to current standards due to cost, i am not going to put up with my reputation getting tarnished by someone who clearly just wants the job doin for virtually nothing and is willing for the tennant to pay for hot water when he only wants heating and vice versa, at the end of me tether with the guy and as long as i cover myself by filling in the benchmark correctly and as how i see it, i will not get in trouble with the relevent authorities. Thanks Guys