The above co-ordinates simply give the rough area of the caches.
The puzzle cache Chalk
This Up Ashwell (GCV42E) and its four associated bonus caches
all make up a circular walk of less than 3km.
The actual co-ordinates for this cache can be found inside the
front cover of the log book for the second bonus cache
10th (GC11418). GPS reception may be a bit dodgy, but the
co-ordinates should take you to the right area. Please do bring
your own pen/pencil.
On the back of the log book for this cache, you will find the
co-ordinates for where the fourth bonus cache
1863 (GC1140B) is actually hidden.