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@TGR @Arducius both solid tips - thank you!
OSB will need to come down anyway, so guess prybar and appropriate safety equipment is a go-er.
Rooms got a bit of everything - need to take out a loo temporarily, and take up a shower tray that we won't be using anymore. Also a power shower that needs to come out, and rewiring to take a standard power socket.
seager-
As someone else mentioned. It’s a dirty job. Using a grinder will make it dirty and very dusty. If you are planning tracking walls etc. more dust won’t matter. It really up to you how to proceed. But be careful with the dust and sharp tiles.
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If they're stuck on good, then any decent sized SDS+ drill with a chisel attachment will make short work. There are bound to be loads on here available for a lend, depending where you are (mine is available if you can pick up from CR7). I definitely wouldn't think you'd need an angle grinder. And seconded to the tips on PPE. A pack of a million foam ear plugs are cheap and will really help with the ringing you would inevitably end up with after whacking a pry bar/bolster with a lump hammer for a few hours (still one of my best bargain purchases, big bag of dewalt ear plugs, I'll probably be handing the bag down to my daughter in 30 years' time). Decent disposable dust mask would also be good. No need to go crazy with full ventilated kit unless it's a regular hobby. And eye protection. Tiles can give off the tiniest, sharpest shrapnel. But again, nearly pennies worth of rated goggles/glasses from Toolstation/Screwfix et al would do you.
TGR
stevo_com
This will create a lot of mess but nowhere as much mess as using a grinder! Smash a tile and get the bar under the edge. If you're "lucky" then the adhesive will be shit and the tiles will fall off the wall when you look at them. Wear boots.