Lord Peter Wimsey: Five Red Herrings
(BBC crime drama, 1975)
A mini-series made in 1975 and starring Ian Carmichael; Jane Ann Liston notes: “In the last episode, when Wimsey is reconstructing the crime, he travels on a bus, presumably from the 1930s. My husband said it looked too clean to be convincing as a real country bus!” Not just any bus,as it turns out - it's TM9347, a 1931 Bedford WHB with Waveney body, and the first purpose built Bedford bus: