There was also a change to the trip mile counter's reset button, which became a push type operated through the instrument "glass", rather than a turn type under the dash. Media appearances and promotions Various British Leyland vehicles were driven by the lead characters in the British secret agent television series The New Avengers, produced between 1976 and 1977. Amongst them was a yellow TR7 hardtop driven by the character Purdey. The car was immortalised as a children's Dinky Toy and Revell construction kit. Lucy Ewing drove a silver convertible on the TV show Dallas. In 1978 Coca-Cola and Levi's ran promotional competitions with the top prizes being three TR7s in special red and white Coke livery. They also featured denim upholstery and genuine jean patch pockets on the door interiors. Also included were a 12V fridge in the boot and a TV in the glove compartment. Two of the three Coca-Cola cars are known to still exist. A yellow TR7 coupé is driven by one of the two protagonists, Lance Stater (Toby Jones) in the BAFTA award-winning television series Detectorists about two middle aged English metal detector enthusiasts, written by and co-starring Mackenzie Crook. In the 1976 television film Look What's Happened to Rosemary's Baby, the protagonist, Andrew/Adrian, drives a TR7. A blue TR7 hardtop was also driven by CI5 agent, Ray Doyle in the ITV series The Professionals, a notable episode being "Private Madness, Public Danger". In the Forza Horizon 4 video game, a TR7 Roadster is a reward in the Super7 game mode. A vermillion orange 1979 Triumph TR7 convertible special-edition was featured in Series 16 of Wheeler Dealers, first aired January 2021. Variants and derivatives TR7 drophead coupé Because of proposed US legislation on roll-over protection at the time of its launch, the TR7 was not initially available as a convertible. In early 1979, Triumph belatedly introduced a convertible version, called the "TR7 drophead coupé" (DHC), which first went on sale in the US (the original hardtop model being known as the "fixedhead coupé", or FHC). A small number of pre-production cars were manufactured at Speke in 1978, soon after the pre-production TR7 V8 (later designated TR8) and TR7 Sprint cars. The British market received it in early 1980. The prototype for the convertible version of the original Harris Mann design came from Michelotti and the engineering to make it work was done by Triumph. TR8