Do not let a plumber/gas person do any work before you have checked out his/her address and corgi number on the corgi website or by phoning. My big mistake. Do not employ R M Plumbing /Ryan Murphy. He gave us an obselete corgi number - 54601. ID card number 1850369 We now think his name is also false as corgi haven't yet tracked him. When you get someone, make sure you get a commissioning certifacte or book. That was above's fall down when someone else repaired 'R M's botch job. He may now have moved area and changed ID. Unfortunately we also paid cash nor a cheque/card. (His responsibilty to declare tax etc).