My stepson asked me to chase out 15mm cables for his towel rail in a building of a similar age. From memory- I was surprised to find that the wall was three sheets of plasterboard glued together. The walls were framed with 25*25mm timber at the top and bottom, to which the exterior skins of plasterboard were screwed (to stop the wall falling over if somebody leaned on it).
I should have twigged as soon I saw how shallow the door liners were. I naively started drilling 3mm holes looking for the studs, and discovered none over a distance of about 1m.
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