Tiling on uneven plaster (1mm of of skim missing in places)

[scep]

When taking off old tiles in the bathroom parts of the skim has also come off with the adhesive. The plaster is sound apart from that. The skim is 1-1.5mm thick. New tiles to go on are 250x400.

Is it likely that such patchiness will noticably affect the tiling or will the adhesive just "absorb" any irreguarites like this. I really don't want to reskim/fill the missing bits if I don't have to. Thanks.

 

[tictic]

skimm over it with a rapidset adhesive if its only ,1-1.5mm in depth.

 

[scep]

great, thanks