Green’s Dictionary of Slang

1. a close friend.

1961

Took & Feldman Round the Horne [BBC radio] sandy: And, of course, Reynard. horne: The fox? sandy: No, ducky. Reynard La Spoon, the choreographer – he’s a close personal, ent he, Jule?

2. (UK drugs) drugs kept for one’s own consumption (as opposed to those which one sells).

1971		R. Woodley Dealer 57: ‘This,’ he said, ‘is absolutely pure, worth maybe four or five hundred dollars. It’s my personal [...] it’s supergood.
1997		N. Barlay Curvy Lovebox 89: There’s a sixteenth of personal which is a piece of leb.