They should know what a Roman chariot race is, since they were once part of the Roman Empire. (People from the U.S. had to hear about yellow matter custard.)
Perhaps the problem was that T-Bird is a brand name. The British used to frown on brand names being mentioned in song lyrics. George Hamilton had to redo his 1956 hit "A Rose and a Baby Ruth" for release in England, singing instead, "A Rose and a Candy Bar." Similarly, to pass muster in the UK, Johnny Bond had to redo his 1960 hit "Hot Rod Lincoln" as " Hot Rod Jalopy" with no mention of any brand names of cars. He also described the hot rod race in question as starting in Southampton, England instead of San Pedro, Calif.