Possibly not used much nowadays but the expression, "as dim as a TocH lamp," was often used up to the late 1960s to describe someone who was not quite as bright as others were.
Read below about TOC - H and a possible 10 Squadron connection. Can anyone throw any light on who was the 1995 aircrew member of 10 Squadron, mentioned in the article?
Click on the lamp to see the light (and the article).
The Original Toc - H Lamp at Talbot House, Poperinge