Continue along the footpath
There's more details about this series (including parking) on the Chiltern Hundred web site.
You're looking for a 35 ml film pot. Remember to collect the letter value in the log.
Uvag 1: Va na vil pbirerq gerr ng urnq urvtug.
Uvag 2: Arnerfg gerr gb cngu.
Uvag 3: Nobhg 25-30 cnprf sebz gnyy gerr gung'f orra phg qbja erpragyl