Oh no ............ bit of a long shot Trixie, but......... 8mm thick, if you try to prise one up, it will certainly break up.
Assuming the tiles are on a solid floor (concrete or sand & cement screed), use an angle grinder to cut vertically all around the area you want to take up. A 225mm grinder should give you a 50mm deep cut.
The idea is to take up the tiles complete with the bit of floor they are bedded on. The bit of flooring will ensure that the thin tiles stay intact.
Does that make sense?
Once they're up, you'll have some very thick tiles. Dig out where they have to go, and bed the lot in sand & cement.