Man I am too young to ever have seen an episode, but even from Mad magazine and blooper shows I know that Benny Hill is an old pervert and would take that to mean the person is going to get properly laid, not necessarily by him. I would never think it would be anything but that!
Folks, this is Benny Hill. No subtlety involved. The phrase is related to “I’d do her” that’s still current.
Yeah, whatever the other myriad meanings for do and done they’re all irrelevant here. The meaning is sexual, of course, as all we Brits knew when we watched him.
If applied to an attractive woman, sexual; if applied to a man or unattractive woman (Benny had some pretty ugly women on his show, as well as the hotties), conned or beaten-up.