The trio in this episode consisted of: Compo (Bill Owen), Clegg (Peter Sallis) and Truly (Frank Thornton).
Compo and Clegg are off to a stag night where they encounter Herbert Truelove ("Truly of the Yard"), an old school friend, who has retired from the police force.
The next morning Barry & Ronnie, still suffering from bad hangovers, help Compo, Clegg and Truly by carrying Foggy into the back of Wesley Pegden's Land Rover still feeling worse for wear from the stag night.
Smiler can't work out what to buy for a wedding present and ends up with a vase from Auntie Wainwright's - which he promptly gets his hand stuck in.
As the ceremony is about to begin, Clegg receives a phone call from Foggy saying he is in Blackpool and that he has remembered the ring and has proposed to the post lady.