Worcester Bosch Greenstar 24i Boiler Failure

[Valvebloke]

So far as I know gas boiler maintenance is illegal except for Gas Safe registered engineers ...

The law is, perhaps unsurprisisingly, a little  more complex than that. Under some circumstances you can do 'gas work' without being Gas Safe registered. You just need to be 'competent'. The details are in Part B, Regulation 3 of the ACOP here http://consultations.hse.gov.uk/consult....tationHome inculding a definition of what 'competent' means.

My advice would be to think twice before owning up, on an internet forum, to breaking the law. If the HSE should decide to prosecute over this your defence will be seriously compromised. To be fair almost all the HSE prosecutions seem to be a) of gas fitters who are Gas Safe registered but who commit malpractice, b) of gas fitters who aren't Gas Safe registered but who do work for which they need to be and c) of landlords who break any of the rules. I don't think homeowners get caught very often. And even if you do the fines are not huge.

VB