evening one and all , thanks for the input on my question. the issue i raised is part of a bigger problem , which is still ongoing! health and safety not interested "i'm dealing with other issues like people dying of asphyxiation" (nice one mr moxon lets hope no student's life is ended in that fashion inthis landlord's accomodation) corgi said "no need for a new ticket because the previous installation was ok" .my problem is how do we know who installed this new boiler , are they competant ? ,and if any problems occur do we blame the guy whose name is on the present certificate ? enviromental people say "as far as i am aware all job's are now complete". pretty good answer i thought ! the problem appear's to be, the landlord is a VERY BIG player in the student accomodation market and nobody want's to upset him. i am a time-served sheetmetal worker who has work in worked in heavy industry,well what's left of it, for 30yrs, where if you ignore a problem, somebody gets hurt. cheers!