I am having a bathroom re-fitted (by a plumber as I haven't time or tools) but will arrange a few days between stripping and fitting as I am aware that the floor needs some attention as it has been lifted in places over the years for re-wiring, central heating etc.
Tongue & Groove is the obvious choice - but is there an alternative sheet type material (not dreaded chipboard) that might make the job easier or more satisfactory?