Well the plumber came today, she looked at the damp patch on the kitchen ceiling, looked at the shower, knocked on a few tiles, said some of the tiles had blown and the shower tray/frame etc was probably leaking as well. She said it wasn't worth try to reseal it and all she could suggest was a whole new bathroom in the region of 8K or a new shower, with some new tiles that wouldn't match the old ones in the region of 2K.
I can't afford either of those suggestions and am somewhat dubious that this just can't be fixed.
Looking again at the damp patch, it turns a sort of right angle which I thought was the pipes but is more likely to be the shower tray I suppose.
Surely resealing will make some difference?
Help!