Visited 6.8.11
A lot easier to find than I was expecting.
From the A436 take the minor road north towards Chastleton. Just past the entrance to a farm (on the right) there is a lay by you can pull into on the left. From here walk west through the trees and you come out into a large field. Keep wallking east a short while and you will see the Long Barrow.
The Barrow itself is now a scrub covered mound approximately 1.5 metres high x 20 metres x 30 metres. Amid the scrub are several large stones laying about.
There are tremendous views to be had to the west. A great spot for a Long Barrow.