A puzzle about a subject dear to the heart of the cache owner, and in honour of an annual event that the cache owner's husband gets quite excited about...
The cache is not at the above coordinates.
The cache can be found at:
N51 51. [2003] [1968] W001 02. [1981] + [1997] + ([2002] - [1957]).
You are looking for a micro bison tube attached to something apt.
