It starred James Bolam and Alison Steadman.
Gwyneth Strong is in this comedy drama too.
The Missing Postman
The book by Mark Wallington is still available although I don't know how much it differs.
I also have a memory of Barbara Dickson being involved.
What was it? A series? A film? A one-off?
I think it was a two parter although it was a long time ago.
It's allegedly coming out on DVD at the end of March: http://www.amazon.co.uk/exec/obidos/ASIN/B01ATOR4ZA/comedyguide-21/
It is indeed. Looking forward to it!