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the mortar appears to be basically dust (softer than the plaster)
If it's lime-based, it should be pretty much the same stuff. If it's harder, it's possible that someone has added gypsum (which would explain the cracking) or even cement (again, which would explain the cracking).
If you dryline it, you should consider battening it too, or risk damp boards. Maybe even chuck in an airbrick.
I'd consider repointing (roughly) with NHL 3.5, rendering with pretty much the same thing (maybe with a pozzolan added) straight on the brickwork. It won't be polished like gypsum (I'm guessing as it's an outhouse, it won;t matter), but if you want a smoother finish, you could skim a chalk render on top and finish with a lime wash.
NotThamesWater
@Polygon
Started to clear the old plaster from inside my outhouse, bit worried as the mortar appears to be basically dust (softer than the plaster) and there are some big cracks in the plaster near the top indicating movement. Wondering if it would be wiser to basically dry line it with something like OSB?
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