ChrisJ wrote:

b) if a) is not possible can we find out where the pipe is leaking
without ripping up the whole floor (is there some detector that works
through the tiles (eg by measuring microwave absorbtion or something).

Perhaps adding a flourescent dye as used by aircon installers may help.
If you can shine some UV light into the void afterwards you may see
where it was leaking.

Is it possible to remove just a portion of the tiled floor without
disturbing the surrounding tiles??

Yes, How you do it will depend on the type of tiles. A Fein multimaster
can take out individual tiles neatly if required (although not withoy
damaging the removed tiles). A trend routabout cutter can be used to
make a neat access hole to the floor void if required after.

--
Cheers,

John.

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