A small cache connecting the Amersham caches to the series in Weedonhill Wood.
Collect the matched letter and number printed in each cache in this series to locate the bonus cache.
Along a good trail, albeit somewhat overgrown with nettles and brambles in the summer. Not machete territory, but possibly long sleeves and trousers if that sort of thing concerns you.
Congratulations to Sair81 for a speedy FTF here.
Honourable mention to Sarasdor and Brian Ze Owl for second and third places shortly thereafter.
Lbh'ir bayl whfg fgnegrq bhg - lbh pna'g gryy zr lbh'er srryvat qenvarq nyernql!