Denzil Tulser is a long distance lorry driver, and a good friend of Derek Trotter, and one of Del's victims when it comes to dodgy goods. In the 1983 episode
Who's A Pretty Boy? Denzil's ex-wife Corinne could however see through Del, and stated that whenever Denzil and Del got together, Denzil ended up drunk, or out-of-pocket, to which Denzil protests, "Yeah I know, but he's a mate." Del endured Corinne's wrath by ruining her wedding day food, after his fridge broke down, leaving the guests eating pie and chips, and Corinne cutting a Jam Sponge cake. The final straw came, when Denzil hired Del, Rodney and Grandad to paint the living room. They burnt a hole through the kettle, ruined the kitchen with the steam, and killed Corinne's canary. Panicking, they sent Grandad to buy a replacement bird, hoping to fool Corinne. The plan however failed, as Corinne came home to find the bird that had died before she left for work, had been resurrected, and the kettle with a hole in it.