Daniel Soroczyn
It would be best speaking to neighbours for a good plumber., or look for engineers that only carry out repairs and services. Appliances are only isolated from the gas supply if deemed immediately dangerous or at very high risk to the occupants and the public. If an appliance has been disconnected from the gas for any reason, you can always get a 2nd opinion and should never feel obliged to use the same engineer to carry out any installs.