Aerial imagery suggests there is another building here (I was looking to see if I could track down the B&B I stayed at in 2002, which I think was Chestnuts at 72 Cumnor Hill, and which seems to be a B&B no more).

The mill stream culvert exit is owned and maintained by Thames Water.

The mill stream culvert entrance; previously, this fed the mill.

"Closed during pandemic? "
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: 2022-07-18T07:38:05Z
POI name: Patisserie Valerie
POI types: building amenity-cafe
#organicmaps

Is George St closed to motor traffic?

How came St Aldate's and High Street are tagged as A420 (which would usually be classified as primary) but they're tagged as tertiary?

Either the A420 number is incorrect or these should be marked as primary roads.

Unable to answer "What street is this on?" for osm.org/node/4072414296 via StreetComplete 53.3:

Are these garages tagged with house numbers? They shouldn't have their own addresses...

26 Arnolds Way has now been demolished.