Wall prep - Tile Advice

[cabbie65]

Hi Guys. I have my downstairs loo to tile. 2 walls are going to be studed out so no issues there, however, one wall was only half tiled and half painted. I've removed the tiles and paint so half is now smooth plaster which is sound and the bottom half Ill need to render. No chosen the tiles as yet but wanted to go for 60x30 tiles. I don't think the wall is flat enough for these but the problem is the way the room is done the wall is directly next to the door frame, (not even an architrave). I have at the most 20mm to play with. I don't think I have enough room to D&D. and was wondering if I was to flatten the wall with BAL render would the plaster substrate, plus adhesive and tile, etc be able to cope with the weight? I don't really want to cut the tile around the door hinges. Any ideas or advice would be most welcome. Many thanks