You don't get 450's running down to Epsom as far as I know. There just
weren't any trains running through Motspur Park, hence spare capacity
on the mainline until Raynes Park. I think the unit at Earlsfield had
failed. Why would you stop a train with just two carriages in the
platform and detrain all the passengers otherwise? Was all cleared up
by the time I came home as I caught an Alton service as far as
Surbiton.

Neill