This park is actually called Isledon Gardens (it is on Isledon Road). Google Maps has it correct, and Street View confirms that there are two visible signs at the two entrances which name it correctly as Isledon Gardens.

Tottenham Hot Spurs Stadium

Unable to answer "What kind of parking is this?" – Parking Lot – way/913590931 via StreetComplete 63.0:

The carpark has been replaced by a residential building

Walford police station not Watford police station.

"name shouldn't have exit number"
OSM snapshot date: 2025-09-06T09:48:08Z
POI name: Charing Cross (Exit 5) (5)
POI types: wheelchair-no railway-subway_entrance-london
#CoMaps android 2025.11.19-2

There's a play area here. Is this another one nearby or is it wrongly positioned

via StreetComplete 61.3

"water fountain not working "
The place has gone or never existed. A user of Organic Maps application has reported that the POI was visible on the map (see snapshot date below), but was not found on the ground.
OSM snapshot date: 2026-02-16T20:35:12Z
POI name: Trafalgar Square 2
POI types: fee-no wheelchair-yes amenity-drinking_water
#organicmaps ios 2026.03.11-12-ios

"digital parcel postbox with solar panel"
OSM snapshot date: 2026-03-21T17:13:14Z
POI name: SE3 32
POI types: amenity-post_box
#CoMaps android 2026.03.23-5

Missing continuation of Central Gardens park, Greenleaf Walk, and missing buildings. https://www.findmystreet.co.uk/map?usrn=20601745

This building has been completed for a while. There are also other buildings missing in the area, some finished and some in construction.