This cache is the detour!
Turn off the High Rougham road and back onto the footpath. Find this cache and then head back to the road to continue on to 3.
(I've named this one 2.5 as it is much harder terrain than the others and doesn't follow the main route so some people might want to miss it out)
Please take care at this one and don't attempt unless you are confident you can get back again! The footpath for this cache runs to the East of the hedge/tree line. Although there is currently also a path on the West side this is not the official footpath.
You are looking for a screw top container slightly bigger than a film canister.