DarenCollins: The puzzle was based on the location of all the Broadmoor Sirens with the final being right next to one of the most unusual locations because the Scotland Hill School it had been protecting had long since given way to housing and it used to sit right next to someone's home.
The cache location has always been a bit tricky being so close to a residence but it had been cleared with the owner of that residence when it was placed.
Since the sirens have now all been removed, it is time to retire the geocache.
I am grateful to everyone that gave it a go and all the kind comments over the years.