Part of an extended series of 20 caches on a walk of 4-5 miles around Grantchester.
Terrain is flat and mostly gravel tracks and bridleways: everything can be cycled comfortably except the first 50 yards or so from the road past cache 01, but be warned that parts are likely to be muddy, even in good weather.
For parking options, see cache 01.
This cache is a dark bronze-coloured bison container attached to the fence, next to a post and a bush growing through the fence. (Originally the post was numbered 400, hence the cache name.)
Links to cache listings: 01 02 03 post 400 tree 04 05 06 07 08 09 10 11 12 13 14 climb 15 16