A couple of trads (see also Dartford Heath - Find that tree) to compliment Rubyshoos Francophile series on Dartford Heath.
When I was younger I used to enjoy cycling over the heath and less enjoyably cross country run there. Rubyshoos Francophile series bought me back over Chrismas and I was amazed how much of the layout I roughly still knew. The donkey pond, glory bumps and concrete roads.
You are looking for a film canister which is hopefully well hidden in an area that I'm guessing maybe quite busy at certain times. So please replace it as you find it so it's out of view.
The Donkey Pond