This is a series based on Ben 10, an American animated TV series which is one of my kids favourite shows. The walk takes in the low-lying Adur Valley between Henfield and Steyning. Once you leave the Downs Link the paths can become VERY MUDDY and even FLOODED after periods of heavy rain so walking boots or wellies are essential. The bridleway near the Heatblast cache can become impassable with flood water after heavy rain so please bare this in mind before you set out as it is a long way back to retrace your route.
I suggest you start with the "Ben Tennyson" cache following the Downs Link south. The caches are a mixture of small clip-boxes and micros. The final bonus cache is a regular sized clip-box.
At least one letter is concealed in each of the other caches in this series. Some of the numbers are repeated. Find them all and complete the formula below.
Please bring your own pencil as none of the caches contain one. As I read somewhere else, a geocacher without a pencil is like a fish without a bicycle!
Ben 10 Caches: Ben Tennyson, Grey Matter, Diamondhead, Stinkfly, Wildmutt, Gwen Tennyson, Four Arms, XLR8, Ripjaws, Ghostfreak, Heatblast and Upgrade
Edited 11th June 2012. I have archived Stinkfly. The bonus letter was E=0
Edited 10th September 2012 for missing/possibly missing caches. D=5, J=2
Formula: N 50 (C+F)(I-F).BEG W 000 (A-D)(B+C).E(H-J)H