More than a million UK households put at risk by illegal gas fitters; 11% in Bristol would let a gas engineer through their door without asking any questions. Around 1.1 million gas jobs are carried out every year in the UK by illegal fitters who aren’t properly qualified, putting householders at risk of carbon monoxide poisoning, gas leaks, fires and explosions, a government body has warned. A study[i] by Gas Safe Register, the UK’s only official gas registration scheme, found that…