The cache is near the sign but not on it. The terrain reflects where the cache is located not the terrain of the ground.
You are looking for a small plastic box with just a log book and no space for anything else.
link to info on Hanslope and area : http://www.mkheritage.co.uk/hdhs/index.html
Honurable mention for FTF of the Previous Cache in Firemountain24
Congratulations to Brockwood Brewer for Updated FTF
If anybody would like to expand to this series please do. I would just ask that you let SmokeyPugs know first so they can keep track of the Village Sign numbers and names to avoid duplication.