If you're following this series in order, you'll go onto the next public footpath at Boundary Farm which goes past the side of the farm and cow sheds. You'll probably have to go over a stile for this cache so not easy for any wheels. And don't be surprised if you walk through dairy cows as you continue on this route (they're very friendly!).
There are a number of goodies to swap.
(Car parking shown in way points for #1 & #6)