This is the first cache in a short trail of 3 traditional caches. You will need to collect the codes from the log books or lids in each cache of the series to obtain the location of the bonus cache.
The cache, which is large enough for small swaps or travel bugs, is located near a mounting block. There is another block at opposite end of the nearby tunnel so that horse riders can dismount and walk beneath the bypass.
Users of the cycle track pass this way, so watch out for muggles.
Originally there way 5 caches in the serires and it led to the glassy slope alongside Aspen Way on Chandlers Reach Estate, known as spytty hill, hence the name. Unfortunately the last two caches have had to be achived, one because of mugging and the other because the location became inaccessibile.