What a wet and muddy day! We attempted this cache during a break in the deluge that had drowned us all morning. The long barrow here is superb. We'd left our Maglite in the car, so the backlight of the GPS receiver had to act as a makeshift torch, in order that we could look around the chambers inside.
Found the cache easily enough. It is well concealed and dry inside. TNLN.
Thanks for an interesting cache!