The steam yacht in the background of one scene is the SY Carola - owned at that time by my MD, and reputedly the oldest steam yacht in the world (citation needed, as they say) and berthed at Buckler's Hard, Hampshire. In July 1984 I assisted the resident engineer in a refurbishment of the boiler tubes - a disgusting, claustrophobic and arduous task. The exterior shots of the cabin/shed where Arthur and Terry meet Moray Watson is a few metres from where Carola was berthed.
The following actors from this episode previously appeared with Dennis Waterman in The Sweeney (1975). Reginald Marsh (Johnny Winstanley) appeared in Abduction (1975). Anthony Langdon (Harry Baily) appeared in Visiting Fireman (1976). And Bill Treacher (Punter) appeared in Selected Target (1976)
The following actors from this episode later appeared with Dennis Waterman in New Tricks (2003). Sarah Berger (Penny) appeared in The Chinese Job (2003). And Rashid Karapiet (Larry Patel) appeared in Couldn't Organise One (2008)