Visited GZ as part of maintenance; all well here, although the "obvious" path to the cache continues to become increasingly overgrown - a fallen tree in the way almost but not quite justifies putting the terrain rating up half a point.
Two bicycles seem to have been abandoned near the GZ. One belongs to hire scheme Ofo and has been reported to them. Making a note here so that if one or both are seen to still be there in the New Year they can be reported as having been "abandoned for several weeks" as per council recommendations: https://www.oxford.gov.uk/info/20060/street_cleaning/168/report_an_abandoned_bicycle
Cache container and contents remain in perfect condition. Go find it!