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Can anyone tell me please how to check and if necessary light the pilot light on a back boiler? Sorry, but I've no idea what is the make or model, so I'm hoping the photo below will be sufficient information.

I have an open vent, Y-plan system that was originally installed in my 3 bed semi in the late seventies. When I moved in some of the radiators barely functioned so I cleaned out the system chemically and added corrosion inhibitor when I refilled it. Later I replaced the valves with TRVs (and...