Hi, I would like to have annual service & maintenance carried out on the Valliant boiler at my house, can you recommend someone good? The boiler was installed by a company called Abacus Gas that since moved to Orpington and must have gone out of business, their site and phone number are dead. They were lovely so I hope they retired to a tropical island instead, but in the meantime I'd like advice on someone else to call. Gas safety is important so I want to make sure the job isn't carried out by idiots.