Only Fools & Horses line - which episode please!

Hi,

Big OFAH fan and I've got a line stuck in my head but I can't remember which episode it is from, it is really bugging me!

Someone says something to Del, and he says in reply "He's done what?" but he says the "what" in a really funny way - long and with a change of tone throughout the word. It's as if what he has been told is a real shock. (I think it may possibly be about something Rodney has done but can't be sure.)

Please help!
Thanks

It's the one with the mad axeman escaped from the mental home.
Rodney is telling him on the phone that Del is locked in with him.

Ah of course! Excellent thanks so much ??

Played by Saffys dad from absolutely Fabulous!

That's a good spot from Goodlad
With scant info

It's this eidetic memory of mine - a curse.

Del also says that when Rodney brings the policewoman he's dating back to the flat..."The Long Legs Of The Law"