My choices would be:

The two Dominick Hyde plays.

BRASS - that lovely spoof on Northern Costume Melodramas.

SINK OR SWIM - started off with three young people living on a narrowboat near Bristol and then moved to university life.

A MOST UNUSUAL PRACTICE - about a university health centre.

THE MISSING POSTMAN - the wondeful two-parter starring James Bolam. They could also repeat "The Hitch-Hikers's Guide" as often as they like.