Turn left when you reach the road, along to the Hen and
Chickens, but don't go there, unless you're thirsty, but turn right
then take the footpath on your left.
There's more details about this series (including parking) on
the Chiltern
Hundred web site.
You're looking for a cylinder about twice as long as a 35mm, and
with the same diameter. Remember to collect the letter value in the
log.
Unatvat va gurer.