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Thanks for prompt reply Do I turn all rads off (except the cold one) at both the TRV and the fixed valve and run CH? Will I have to bleed air from the cold rad?

I managed to drill through the wall and a CH pipe downstairs. (my detector did not pick up the pipe - I am aware that these detectors are not entirely reliable and am normally very careful - not this time though!) I closed all stop valves to stop leak. Emergency plumber came and fitted a...