Unable to answer "Are the pickup times of this collection box still correct?" – Royal Mail [NE29 762;NE29 1762] (Mail Drop Box) – https://osm.org/node/4684997568 via StreetComplete 62.2:

Not visible, may have been removed when the street was pedestrianised.

Attached photo(s):
https://streetcomplete.app/p/325271.jpg