It is a shower over bath situation. Dampness in several places and rot beside the outer corner of the bath indicate a leak. Its source will be either behind the shower control, behind the bath itself where there is a small crack in the seratone, or behind the bath taps. If it is behind the shower control - this wall is in common with the kitchen and there is some dampness there also, the bath may not need to be taken out. Otherwise it will need moving and the seratone probably will have to be replaced, alongside any other wall repairs. A plumber may be needed. Also the window sill has rot needs replacing please
Partner with Builderscrack
Get work