However, I'm unsure how to fix the boards to the wall. I've seen recommendations to plug and screw, but that sounds like a lot of work for a whole room. Would it be acceptable to simply stick the boards to the wall with tile adhesive or similar (and if so, what kind)? Three of the walls are external or party (so presumably brick or block); the remaining I think is plasterboard (hard to tell right now as it's behind the shower). I mentioned "bashed about", but it's nowhere near bad enough that I'd be worried about chunks coming off taking the board with it. I haven't chosen the tiles yet, but I'm not planning on anything especially extravagant and heavy.