I bet crafty doesn't remember them
I've seen some! Not sure if they were still in use
They were in one of our company's older buildings, a training room above a shop. It hadn't had any work done to it for a long time, it was rarely used, TBH. But one Xmas they decided to use it for model store, and needed it heating! So they dragged out all the oil radiators they could find. Tripped the electrics. Electrician refused to replace fuse, as it was an old wooden fusebox (pre-Wylex standard). So they had a new feed taken from the store's cellar to a metal CU, and heaters put in permenantly.
Now I think on, I think the rooms had pictogram lights in addition to the originals.