Denzil Tulser (born 8 August 1945), is a character in the popular BBC sitcom Only Fools and Horses played by Paul Barber.

Denzil is a long distance lorry driver originating from Liverpool, 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 then-wife Corinne saw 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 incurred Corinne's wrath by ruining her wedding day food after his fridge broke down, leaving the guests eating pie and chips and Corinne and Denzil cutting not a wedding cake but a jam sponge. 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, turning it into a "Turkish bath", and thought they had 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 and told them she had found the bird dead earlier that morning, before she left for work.

Denzil and Corinne divorced later in the series, but Corinne herself only appeared in one episode. The actress who played her, (Eva Mottley), committed suicide, so the character was written out of the show. Denzil's trade as a long-distance lorry driver also contributed to the divorce. In the 1985 Christmas special "To Hull and Back", while driving to Hull, he began to hear Del's voice. Del had been locked into the back of the lorry, after using it for a secret meeting with Boycie and Abdul. Arriving at Hull, Denzil headed into a café to get some food, and coffee to wake himself up. When eating, he saw a reflection of Del's Reliant Regal van driving past. He then saw Del when stopped at a crossroads. Thinking he was losing his mind, Denzil headed to the cliffs to relax for a bit. The final straw came when he saw Del on a fishing trawler heading out to sea. Although Denzil didn't actually imagine any of these things, he was convinced he was seeing things and stressed out and ran off shouting hysterically "I'm sick!". During a police investigation into diamond smuggling later in the episode, it was revealed Denzil had had a nervous breakdown.

Denzil, who has five brothers, moved to Peckham from Liverpool aged 13. He attended Dockside Secondary Modern and managed to make his way into the gang of Del, Trigger, Boycie and the rest of the boys. When in detention in the science hall, Denzil had his eyebrows burnt off after Del and Trigger blew the science lab up with homemade fireworks.

In "The Jolly Boys' Outing", it was revealed that Denzil used to work as a bus driver with Sid, which meant he drove the coach to and from Margate after Harry the bus driver was overcome with fumes and presumed drunk.

Denzil made his last appearance in the first episode of the spinoff show The Green Green Grass, when he informed Boycie that the Driscoll Brothers were being paroled. He was also seen in the episode "I Done It My Way" in 2009, where he appeared in a flashback episode of Only Fools and Horses.

Denzil also appeared in Rock & Chips in 2010, portrayed by Ashley Jerlach, who imitated Barber's distinctive Liverpool accent for the role.

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