The floor that I posted 4 weeks ago has now come up.
Tiles came up easy. 6mm trowel used and dot n dab, no back buttering, 3mm ply fixed down with 45mm screws (No pipes hit luckily). Lifted first row of tiles and rest came up easy, there was standing water under tiles and ply was already rotten and mouldy. This bathroom was done 3 months ago.
The floor is actually perfectly flat and level so I've no idea why they dot 'n dabbed in places.
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On a perfect surface... they must of not been holding the trowel right &/Or pressing to much on some & not enough on, As As before it is a shame we cannot name & shame... just to Save the Customers money (And in your case John, there floor!)