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If you wanna go manual I bought this recently but didn't use it after borrowing a mate's hammer drill. Welcome to borrow (SE23) or buy for £10 if any use...
https://www.diy.com/departments/magnusson-3-piece-bolster-cold-chisel-set/1801967_BQ.prd
Hammer drill with chisel bit will make light work if you don't need to use the tiles again/can sort out the wall behind...