This one can be grabbed as part of my series in Thrupp and Bourne Lanes.
You're looking for a small cache with only a log-book inside, so please bring a pen along. Follow the footpath down from Bourne Lane until you arrive at a stone wall that is part of a derelict shed next to the fence. At GZ there used to be the remains of a rotten tree stump, hence the name. Now the cache is placed at the base of the middle green fencepost on the other side of the path
Onfr bs gur sraprcbfg.