Bathroom Best Course of Action

[theandroids]

Hi, can anyone tell me the best course of action before tiling on these walls? The majority is drywall that I have removed paint and tiles from. Have not really damaged the drywall to the extent of replacing them completely, just a gouge here and there. Can I tile over this or do I have to do something else prior to doing so? Eg. PVA, Ardex feather finish, Thistle Multi-finish, liquid tanking etc.

 

[Flintstone]

What tiles are you wanting to use ?

 

[theandroids]

What tiles are you wanting to use ?

100x300 mm tiles