All waypoints, and the final GZ, are accessible by wheelchair, although the cache itself could not be reached by someone in a wheelchair.
The suburb of Petone now sits on a site where in 1840 the New Zealand Company tried unsuccessfully to found a settlement with the name of Britannia. It was the first European settlement in the Wellington region and retains many historical buildings and landmarks. Along Jackson St, many of the most notable buildings have plaques detailing their history. All the information you need can be found on these plaques.
George London, who was to become a mayor of Petone, sold the premises at 28A Jackson St in 1943.
This building comprised B individual shops with a series of oriel windows corresponding with each shop below.
Built in about 19C0, occupants of this building included dressmaker Ethel Bradstock.
The first tenants of this building were pastry cooks Unkhorn & Son in 19D1.
Henry Muschamp Waddington (owner of "Dearlea", unfortunately I have unable to find out more about Dearlea) owned 3E7 Jackson St from 192F.
The first occupant of this building was the Petone United Friendly Societies Dispensary in 192G.
The final, which is a 5 to 10 minute walk from Jackson St, can be found at:
41° 13.ABC 174° 5D.EFG
Check sum (A:G) = 27