Thanks, Darren, that's what another pro tiler told me a few weeks ago. Why on earth would the adhesive experts have recommended it for fixing in a small bathroom?
I can take on board that my men were working with a new tile etc, which is why they were dependent upon instructions from the suppliers - not ideal maybe, but they weren't just flying by the seats of their pants. What gets me is that the suppliers passed on all the adhesive firm's instructions but are now trying to wriggle out of what they said. If my guys were at fault, eg using marine ply, tiles too heavy etc, we'll sort it out between us, but I don't think it's as simple as that, especially as the suppliers never raised an eyebrow when we went back and said Rapidset hadn't worked - and they had all the details re location and substrate. They went straight into sending us onto epoxy grout as a sticker, saying my chap had been given the wrong stuff in the first place. Gotta be a case.