The original cache in Wills St. had to be archived due to works being carried out here.
The new cache is in a different location.
The initial aim is to take you to some Streets/Roads/Tracks to which you might not otherwise go.
Ultimately it is for you to gather some information which will allow you to find a final cache.
As the published co-ordinates for the final cache are nowhere near GZ, you will need to collect the information from all the caches in the series before you can calculate the correct co-ordinates.
Don't forget to write down the info & due to the size of the cache bring your own writing stick.