City wall looks like it is a duplicate of a nearby wall, or historic only, at least partially. It currently cuts straight across the educational landuse, in front of a shed which can be seen from the service way.

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From the wiki
historic=citywalls

Walls that are still standing and in good shape probably qualify for both barrier=city_wall and historic=citywalls, in that case historic=* is obvious as all city walls are nowadays historic.

Note that existing city walls that are ruined, maybe with only foundations remaining may no longer qualify as barrier=city_wall but are still historic=citywalls.

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Mapillary 2022-09-16 by annekaro
https://www.mapillary.com/app/?pKey=651087220070579&focus=photo

Way continues under roof; survey needed

For the individual buildings in this terrace

Street name "St. John's Place" looks like the name of the alley behind this terrace. (alternatively it is the terrace name)

Unlike nearby "Saint John's Church" and "Saint John's Court", "St. John's Place" is abbreviated. Are you sure this is the case?

These buildings are still in a associatedStreet relation with Dublin Road. They should probably be removed from it.

Missing bus bay
("bus bay only")

Large round stone (lit)
https://www.mapillary.com/app/?pKey=499201881233065&focus=photo

Check if POI still exists; survey needed

Company seems to be more or less fully liquidated as of 2021.
https://en.wikipedia.org/wiki/Xtra-vision

node/1257321465

Missing defibrillator; survey needed

Preferably upload proper image to Mapillary (ok for use in OSM), and/or Wikimedia Commons (with compatible license) to accompany it.

Based on below article (use for reference only!)
https://mooncoinceltic.com/2022/09/16/new-defibrillator-installed/

Housename "Block A" looks like a unit number (addr:unit), see
addr=*