External wall….what to do?

[RichMc85]

Morning all,

Stripped the paper off in this room and planned to skim all the walls. On this wall all the plaster was blown so it’s now back to brick.
what’s the best way to fix this?
It’s a 1930s house with 9 inch wall, my understanding is that dot & dab can’t be used here due to risk of cold bridging and creating condensation behind the boards?
Would it be better to render it with some hardwall instead?

Thanks!

 

[blup]

Render or batten and board

 

[Odds]

Was it damp? The crack in your ceiling looks ominous...