Don't know if it's any consolation but I took all the tiles off my
kitchen using a 10 quid thing from Tilemates or Tiles R Us.

Basically it's an A5 size bit of steel plate sharpened along one short
edge with a large chunk of steel attached to the other short edge. A
short handle is attached to the weight. You drag it down the wall using
the weight to give you a bit of 'persuading force' with the sharp edge
between the back of the tiles and the wall. Frighteningly crude and
effective.

Richard