*** 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 ***
Mr Platt is the clockmaker who keeps racing pigeons, he appears in every episode, although unseen (behind his door) in episode 9.
*** The Cache ***
You are looking for a film pot.