On Saturday, March 14, 2020 at 5:30:43 PM UTC, Tricky Dicky wrote:
The presence of mould may not be due to a leak although being under the bath makes that a favourite. I would expect to see water marks as well as mould, you did not mention any being present. Mould could be present simply through lack of ventilation and you have a cold spot allowing vapour to condense.

If it is a leak from the bath then the the most common cause is the seal between the bath and walls followed by loose piping either waste or to the taps. I would check out all of these before more drastic work. The bottom line is if a water leak is the reason for the mould you need to find it and sort before doing anything else, covering it up will not make the problem go away.

Richard

Leak was from a dripping pipe
as well as from people splashing and getting out of the bath which cant be stopped, hence I want a sloping floor

[g]