John wrote:
I caught a District from Barking to West Ham this evening (one of the
refurbs) and looking out the window at East Ham noticed that the Next
Train display told me that it was District for Tower Hill and Victoria
(I think) but then at the bottom said "Change at Aldgate East for
Metropolitan trains". I checked at Upton Park and it said the same.

I can't remember when Metropolitan trains went to Aldgate East...
That sign is from before the Hot and Cold was formed when it was still
the Met.