Unable to answer "How many bicycles can be parked here?" – Bicycle Parking – node/2375436393 via StreetComplete 61.2:

Double check whether this cycle parking still exists. I couldn't see it when passing on a bus.

54a,b,c,D right to left

via StreetComplete 61.2

Attached photo(s):
https://streetcomplete.app/p/299810.jpg

Lots of paths still to map in this area.

Looks like a change of use here now

Potential public right of way in Bing imagery?

Check road layout. Mapped layout differs from Bing imagery, but I can see that the Bing imagery is also out of date (doesn't have the EV chargers)

Review route of path -- it won't pass over the dual carriageway like this.

Unable to answer "This shop has been vacant. What’s here now?" – house number 9;10: Vacant Shop – way/59140564 via StreetComplete 60.0:

Shop below offices. See photos.

Attached photo(s):
https://streetcomplete.app/p/256537.jpg
https://streetcomplete.app/p/256538.jpg

Is this NE corner really part of Central Middlesex Hospital?

It looks like this cycle path should be aligned slightly to the east near these parking spaces, going by the Bing imagery. Check whether this is reflected on the ground.