Except it's not a grenade, or a grenade fuze. Obviously the BBC are incapable talking to anyone with any form of technical knowledge.
Anyway, BBC rant aside, I reviewed this on Monday, and it's likely a Romanian SH82 mortar fuze. See below
https://twitter.com/blueboy1969/status/1612480524723032065
There's a possibility, as I mentioned above, that it's a Romanian M6R mortar fuze. Though I'm not to sure what the fuze's nose tip looks like without the safety cover in place.