The pub name and sign "The Lamb" with a wolf's head is a clear tribute to the pub (and sign) "The Slaughtered Lamb" in the 1981 movie An American Werewolf in London (1981).
Annette Badland and Louise Jameson would both appear in Bergerac (1986)
When Barnaby and Winter walk into The Lamb pub, everyone inside stops what they are doing, and the pub goes quiet, clearly anther nod to An American Werewolf in London. Coincidentally, (or not) a darts match is taking place in both pubs.
Three of the actors in this episode have appeared in the long-running series Doctor Who (2005), and have each traveled in the Tardis: Louise Jameson (4th Doctor), Annette Badland (9th Doctor) and Mark Williams (11th Doctor).
Louise Jameson played Susan Young for 5 years, girlfriend of John Nettles on the TV series Bergerac.