Convenient though it is the 3 hours parking time here will not be enough time to do the full trail - consider re-locating to the on street parking near the other Jaunt #20 Plantation Gates for the other side.
These are the Plantation Gates on Wigan Lane which is a grand entrance to the Haigh Estate. This is a major landmark for all Wiganers.
This first cache is positioned in a readily accessible place so it can also be done separately as a cache and dash.
Be aware that this is a high muggle area so stealth is important - the cache is a black nano.