Lee i will gladly go back with builder/plumber/polypipe and the tta if need be if it goes boobies up,the job was done by the book, to all the aboves speck.
the customer was there when i was not very happy about it, even he was arguing with plumber/builder because of what i explained, so when they said " ive done loads of these and been tiled with no prob" 😉
So he just told me too go ahead.
We will see mate