In an earlier contribution to this discussion,
Nigel Heather wrote:

Nope, its a downstairs room. Most modern houses that I have seen
(mine included) have plasterboard walls and concrete floors on the
ground floor.

All piping is in the wall somewhere, so I expect would have to tear a
lot of plasterboard away to find the main feed and return circuits.

Cheers,

Nigel

I very much doubt whether the main flow and return pipes are inside walls.
Much more likely to be in the ceiling space under the upstairs floorboards.
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Cheers,
Set Square
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