Scutch chisel, scraper & wire brush.
Needle gun to getbthe last bits off, if you want to spend money, and if the bricks aren't too soft.
Or just lime render over it.
It's pretty damn loose, so hopefully shouldn't put up to much of a fight. Will go at it tomorrow.
I'd suggest a proper respirator mask. Lime plaster dust is not as bad as gypsum, and using a lump hammer not as bad as an SDS chisel, but it's still no fun to breath that stuff.
@Polygon started
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Scutch chisel, scraper & wire brush.
Needle gun to getbthe last bits off, if you want to spend money, and if the bricks aren't too soft.
Or just lime render over it.