I think Col is referring to "Slug", a caveman character Andrew and I produced for Knave magazine back in the day. There were several pieces of original artwork from the strip adorning the walls of Foreigners bar in Dundee---a place Col confesses to frequenting around that time. The strip ran for several years and was suitably disgusting for the magazine it appeared in.
I am, indeed, a Dundee United supporter, as was Hamish in the Beau Peep strip. I vaguely recall writing a series of scripts where Beau and Dennis were playing football. Beau was pretending to be someone like Bobby Charlton while Dennis was pretending to be Sammy Davis Junior. I may have just come back from Foreigners when I wrote that.