Spot on that man. I was thinking I would have to do this hence my
original question, thanks.
Maybe but it's the complete kit including what they call an aquadec
(flush shower tray) primer, membrane, shower trap with re-inforcing
tape and some weird putty stuff. I haven't got round to water proofing
yet but I'm using 18mm WBP grade ply to secure the tray between the
joists which rests upon battens and I have some noggins to support all
the edges. An overlay of 4mm ply brings the floor all flush. I used
some spare french oak boards to completely reboard the room too as the
old boards were knackered after years of hacking apart. So far so
good.....

Cheers

Richard