Part of a series of caches exploring a beautiful and out of the way area of Buckinghamshire forest. You may well see deer and horses on your travels, and quite possibly mountain bikers who race in the area.
Collect the matched letter and number printed in each cache in this series to locate the bonus cache.
You're looking for a film canister. GPS might go a little awry, but the hiding place is next to the path, and you won't have to go crawling through lots of brambles and nettles.
Well done GoldenRanger for a remarkably serendipitous FTF.