*** The Series ***
A series of caches intended to be found by bike around the villages of of Nyewood and Dumpford, please see OYB - Trumpton : The Mayor for details of the series, parking, refreshments etc.
*** The Character ***
Captain Flack is the Fire Brigade's commander, who performs the roll call in every episode - "Pugh, Pugh, Barney McGrew, Cuthbert, Dibble, Grub". He appears in every episode.
*** The Cache ***
You are looking for a screw top jar.