A Circular letterbox series of 19 caches. Cache is not at the published listing. You will need to work out the formula below to find the coords of the cache. All caches contain a self inking rubber stamp. The series has been put out to publicise the Kent Mega 2014
X can be found by studying the title. X is the same for all 19 caches.
Cache can be found at:
N51 11. (X+X) (X+5) (X-X) E000 23. (X-1) (X-2) (X-1)
Cache is a magnetic double sized film pot