jacob wrote:

What about vinyl? The wet room floor constructed as a shallow pan (4
inch deep?) from w.b.p. ply or other stable-when-wet material. Corners
with internal radius - made up with silicon sealant or other compo
applied with profiled scaper, or timber moulding applied. Sheet vinyl
laid on dressed into horizontal corners but with vertical corners cut
and bedded on sealant and held in place with screw-through corner
pieces , wood or metal etc.
Drainage through Wade gulley GV 52.
Walls tiled or whatever but with drip detail at bottom edge to drain
into the pan - not behind the vinyl.
Has anybody experience of this construction? Are there paticular
vinyls or other materials which might be more suitable?

I've seen shower enclosures lined with sheet vinyl - it looked surprisingly
good - and no grout to scrub.