He is coming round later to look at the dripping and has been doing lots of jobs for me over the years. I feel terrible questioning his workmanship. Not sure how to go about it :-( but want this sorting.What Stigster said plus the Benchmark sticker on the cylinder should have been completed with the installer's name and contact details, etc. Without this any warranty on the cylinder will be invalid.
Yes, you can. In a case like this you have between six and seven years to sue for breach of contract.
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He has registered it with building control. I have seen in their site but I don’t think I have the certificate.There is no time limitation for redress on non compliance with regulations before they are identified.
So the installer is qualified. He / she installed it two years ago, registered it through their certifying body and you have been issued with a Certificate of Compliance by Building Control. That is what qualification means.
All you do now is send to Building Control the certificate and the pictures you have posted here - they will do the rest, initially by contacting the Certifying Body.