Dave

I forgot to mention the tanking ..sorry there simon..was more concerned about the vinyl sheet coming up.....if the floor is concrete then just tank with balWP1 and if its timber use schluter kerdi or bal WP1..presuming the floor is sheeted with ply and thick enough to accept tiling....if not you could use backer board and tank this instead......dave..

p.s. if the backer board is water proof then no need to tank it....