I'm also British (SW) without the French or many different places - 'cramps' is new to me as far as I can remember. I'd call it a G clamp, and so does Screwfix,

I'm also British (SW) without the French or many different places - 'cramps' is new to me as far as I can remember. I'd call it a G clamp, and so does Screwfix, fwiw. (Wiktionary does give the clamp meaning too, not with a UK qualifier though. https://en.wiktionary.org/wiki/cramp https://en.wiktionary.org/wiki/cramp)