This route is on private land so should not used.

Unable to answer "What surface does this road have?" – Track / Land-Access Road – osm.org/way/664389180 via StreetComplete 58.2:

Path is private lane and cannot be accessed

Attached photo(s):
https://westnordost.de/p/229672.jpg

Is the post box GL17 89 or GL7 89? This should be GL7 area.

This is also Adbury Holt

not a track - should be a service road:-
* it's a public highway
* osm.wiki/Tag:highway=track "Some examples where highway=track is generally not appropriate:" "A minor road with permanent residences along it. See highway=residential."

Mill House Lane in Longparish is considered as a public highway according to Hampshire County Council, not a private road:-

MILL HOUSE LANE
Road Name: MILL HOUSE LANE

Road Number: 40013077

Road Class: U - Unclass Adopted Metalled

Road Reference: 74U54 AX 07

Road District: Test Valley

Has Santander closed here? There is a branch further down the road. The website lists the branch as 32-34 Regent Street.
osm.org/node/2375095001

Add to this...

presumably "Savernake Forest Hotel" is a tourism=hotel?

osm.org/way/1087564801

This road is missing a name