animmo
Unable to answer "What is the house number of this building?" for https://osm.org/way/685212887 via StreetComplete 33.1:

Numbers 3 & 4 are one building (Card Factory & WHSmith), and 5 is its own building (EE/BT).

Attached photo(s):
https://westnordost.de/p/51051.jpg
https://westnordost.de/p/51052.jpg