Details of this geocache trail can be found at the first cache.
Although you have now left the Downham Woodland Walk, you can continue along the wide grassy central park area that carries on into the distance and then turns left.
You are looking for a custom cache.
This series is being made open to all again (rather than premium only) - but caches will be archived as they get damaged or go missing, and the series will eventually be retired. Please look after the caches to preserve them as long as possible, and happy hunting!