Thanks for the info' plumbob, but unsure if we should block up the window. Pity because we have already purchased the shower mixer to connect to our Combi Boiler system. Sorry for the delay in thanking you :D
I have been advised to block up my bathroom window to allow the fitting of a over-bath shower unit, as this is the only place it can be sited, but I am concerned that doing so will increase the amount of condensation in the room, which is a very small bathroom. Does anyone have any thoughts on this ...