Removing all wall tiles in my bathroom

[Willbeforced]

How on earth do you get tiles off plaster board without destroying the plaster board? I've found that some tiles will come off easily where the plaster board was painted with a gloss finish. The others however, are not on a gloss finish and are very difficult to remove without pulling half the plaster board off.
Some people have mentioned to tile over the original tiles, but this is not possible as only half the room is currently tiled and I plan to tile the whole bathroom.

Anyone got any ideas??

Thanks

 

[SBDecs]

Try a wide blade scraper and get behind the tile... If this fails remove the damaged plaster board and replace it with new... Very easy to do just reinstate the new to the old baton fixings and your away. Homebase or any DIY store will supply you with plasterboard.