2 things:
1)There's a thing (approx 3.5" wide) you can put on the end of a drill to get tiles off much faster than using a lump hammer & bolster - "tile removing bit/chisel for an SDS plus hammerdrill". You can get it for approx £18 from Screwfix or similar.
2) When using this thing on the end of a drill, wear safety goggles or a visor, a mask, cover your hands & arms, and you might find it helps to tape long runs of the tiles so they fall tidily instead of flying off at you. Seriously. Got a safety visor with a 4" long scratch made by a tile flying off the wall.