Just a noter from past exsperiance, Get intouch with enviromental health, They will survey the address and with in reason, could suspend the house until the work has been done while the landload pay's for you in a hotel! 

Hi.....im having the same problem, repairs need doing, but not getting done, its all wrong, i have rubbish at the side and at the front of the house, damp, pipes on show, and i have two children,...even little jobs like silicon around the bath, are not getting done, so all the big jobs, have no chance, my advice is to go to the citizens advice, they will help you, give you as much free advice as they can, as they deal with things like this all the time, thats what i will be doing,next week, if all the repairs are not fixed. Does anyone no if u have to be corgi registered , to touch any gas equipment, and do you no if all tenants need to be shown a certificate, to prove that all gas equipment is safe, i have asked my landlord for this , but says it isnt against the law, not to have one, although i have been told different, by friends..??