This cache pays hommage to a radio series which filled many hours of sitting in the backseat of the car on family holidays as a child. Throughout the UK, France and Spain this series was with me, and even made it's way vicariously to the islands of Greece where calls of "JimJamYAHA" could be heard off the coast as I launched myself into the water.
As a bonus the series also honours my home county!
If you don't know the series, don't worry, this is not a puzzle cache and you don't need to know it to find the cache. However, if you do then you may find the hide slightly more accessible.
I shall leave you with this departing wisdom: beware of the Barghest.