What's the best course of action for this wall?

[theandroids]

Good evening all. Removed some tiles in bathroom and damaged the wall. Plaster has come off, underneath I think its bonding plaster? Haven't a clue.
What would be the best repair method for the wall, also can I installHardiebacker without plastering the wall after the repair?

Will be installing mosaic tiles.

Any help is appreciated.

 

[theandroids]

No need to skim, if you are going to board over, use a SBR or tile primer, stick pro warm or what ever you want to use with a s1 tile adhesive, Wack a few screws in, then tile

Will do.

 

[theandroids]

Just an update for anyone like myself with a similar situation who might read this thread.

I've been told by British Gypsum to use
Thistle Bonding 60 if you want to repair this kind of damage, before installing backing board.

 

[Waluigi]

60 being the time it takes to set I assume? Never used it.

I prefer to use dirty water or a handful of cement in the mix if I want to patch up quickly.