Dealers were usually encouraged to enter the series with company management including owner Peter Wheeler and managing director, Ben Samuelson also competing in the series. Wheeler used his expertise to develop the Speed 12. Many drivers who are now competing in the Le Mans Series, FIA GT Championship and 24 Hours of Le Mans, such as Jamie Campbell-Walter, Bobby Verdon-Roe, Martin Short and Michael Caine, developed their skills in the series. Nigel Mansell was to compete for a one off race at Donington Park in 1993 but was unable to after he was hospitalised following a BTCC incident. Other infamous drivers who have guest driven in the series throughout its history include Colin McRae, Andy Wallace, Tim Harvey, Anthony Reid, Tiff Needell and John Cleland.