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Great stuff :thumbsup:

The expansion vessel won’t be leaking as such, it will be the diaphragm inside the expansion that splits. Your plumber will be able to check this by opening the Schrader valve and testing to see if there’s water in there. Regards the pipe under the floor, if it’s protected it should be ok, it’s...

I do a lot of leak detection like this, and would say get the boiler checked out first, expansion vessel is the main one. Would contact your buildings insurance as you should be covered under ‘Trace & Access’ The cover is usually up to £5k, and will cover the tracing and accessing the leak but...

Try balancing the system. The 2 x rads in question are they the furthest from the boiler? If so, shut the lockshield valves ( not TRV's) down on the rads nearest the boiler and then quarter turn back on, so you are slowing the flow down to these rads. Open the lockshields fully on the rads in...