This is important as it would make it nigh on impossible for illegal installers to put the general public in danger, by installing equipment incorrectly. It would allow all installations to be traceable and if a poor/unsafe installation was found it would mean the HSE could actually ACT.
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There are around 40 deaths and 200 hospitalisations every year attributed to accidental CO poisoning. The department for health indicate that there are 4,000 attendances at accident and emergency departments for CO poisoning each year in England. This logical step would make all those cases possibly lead to prosecution.