Leaking boiler isolation valve

[WC1]

Also for consideration, this from hse :

Can I use a plumber to install the appliance and then have the gas work fitted by a Gas Safe registered engineer?​

A non-registered person may carry out 'wet work', ie install water pipes and radiators for a heating system, but any work on the gas boiler itself and the final connection of the water pipework to the boiler, must be done by a Gas Safe registered engineer.
Source:

Gas safety check - who can do it? - HSE

Landlords, responsibility, gas, pipework, flues, appliances, gas appliances, gas safety check, record, records, maintenance, gas safety, HSE, health and safety, gas fitter

www.hse.gov.uk

 

[Ric2013]

Also for consideration, this from hse :

Can I use a plumber to install the appliance and then have the gas work fitted by a Gas Safe registered engineer?​

A non-registered person may carry out 'wet work', ie install water pipes and radiators for a heating system, but any work on the gas boiler itself and the final connection of the water pipework to the boiler, must be done by a Gas Safe registered engineer.
Source:

Gas safety check - who can do it? - HSE

Landlords, responsibility, gas, pipework, flues, appliances, gas appliances, gas safety check, record, records, maintenance, gas safety, HSE, health and safety, gas fitter

www.hse.gov.uk

Yes. The same wording as in Technical Bulletin 014.

I'm wondering now whether the actual situation might not be the following: HSE couldn't care less if you disconnect at the internal compression joint or cut the pipe 2" further along. What they are rightly trying to avoid is unqualified illegal boiler installs/relocations in which plumbers claim to have merely replumbed the flows and returns, or plumbers fitting boilers to the wall and creating situations in which RGIs are encouraged to sign off a boiler that they have only installed the gas supply to. So, to try to ensure people respect the spirit of the law and don't try to find loopholes to try to cover up illegal work, the HSE makes a rule that the final connections have to be made by RGIs.

Does this seem plausible?