my house is similar to this in that the walls are Artex above the picture rail, and the ceilings are Artex as well, and being built in the 30s the Artex probably has that white asbestos in it. Super health hazard here
We've got white asbestos in the artex ceilings in every room plus in the floor tiles downstairs and as yet not sure what's in the adhesive that holds them down. Luckily as a council tenant we don't have to foot the bill as and when it gets removed