[Steve in Pudsey]

There are several terms for ‘Broom cupboard’ [which, incidentally comes from the original camera-in-a-continuity-booth solution for in-vision childrens presentation pioneered by the BBC (in the UK) with a certain Phillip Schofield - he joked that he was presenting from a broom cupboard and it kind of stuck]

I'm going to be really pedantic here - he originally coined the term in reference to the spare continuity booth associated with NC3 (the backup Network Control room which also doubled as Sub-Control, a gallery without a studio for mixing OBs etc) which was smaller and somewhat antiquated compared to the NC1 Con.  Over time the term stuck and the origins were forgotten.