Owain wrote:
BRG wrote:
Not Dave answering, but I would suspect something along the lines of
Paramount Partitioning - plasterboard/egg-crate/plasterboard and all
held together by something like 35mm square studding at the sides,
top and bottom.

It sounds like something they'd use just after the second World War
when building materials were in short supply.

Owain

Our 1965 dormer bungalow has it for all non-loadbearing walls.

John