Can anyone recommend a good, honest, gas engineer? The last to service my boiler & fire disconnected my fire without my permission, said he "didn't like flueless fires" as the ventilation, unless blasting through the house, could never be adequate. He then recommended a fire with a flue (exorbitantly expensive) that he would install for me. Now I have no fire and the boiler is losing pressure....I have a carbon monoxide tester...