Blown plaster.seems its only the wall paper thats holding the very thin skim coat onto the walls.
Is that still used in current construction? Here plaster over lathe (thin wood slats with gaps between) was common up until sometime in the 1940s or so when sheetrock was developed and since then that has been used everywhere. There are still a few people around who do the old fashioned plastering but it's only used in historical structures.
In the US, wood framed houses with sheetrock are the norm. In the UK, bricks are the norm (even in new houses).
Having lived in both countries, my experience is that UK brick houses are much more durable than the US constructions - there was almost no maintenance on my UK house, compared to my American one (new vinyl siding, new roof, new gutters, new windows, it's never ending... the materials are simply not as durable as brick walls and tile roofs).