Hmm yes I agree. I don't think witholding rent would achieve anything. We definitely want to stay in the house for another 12 months and the contract renews in August, so don't want to jepordise anything regarding the tenancy. However, this isn't the first time the boiler has broken and the landlady has taken, what I consider to be, an unreasonably long time to arrange a repair. It just seems like she does EVERYTHING on a shoestring, and we're suffering because of it. I just got my dad, an ex plumber, to give her a call and 'make her aware' that there's a discrepancy with the certificate and that it would be in everyone's interests for her to look into it. He was very nice and gave her the benefit of the doubt, but just asked that she find out the installers registration no. But I just got an answerphone message from said dodgy installer (or pest controller?!) asking me to call him for a chat.... erm NO!