An image of a 1964 Morris Minor from The Young Ones, is currently listed with no episode:
http://www.imcdb.org/vehicle_73892-Morris-Minor-1000-1964.html
It was in fact, in episode #1.03("Boring").

Additionally, after some research, I found that this London PD van;
http://www.imcdb.org/vehicle.php?id=306251
..is a Ford Transit, as Pomtidom said it was.