Spacethegas, thanks for that information. It is really helpful. From what you say I take it that the back boiler would still operate as normal. And if I needed to relight the boiler with the pilot light this would also be fine. Sorry if these are stupid questions only I know nothing about how the flow of gas etc works.
Out of interest Why do you want to do this.
There will either be a 3 way gas cock under fire that just needs turning to boiler only or there will be a seperate one to fire that also just turns off(with spanner etc)
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