If you are considering walking this route yourself, please see my disclaimer. You may also like to see these notes about the maps and GPX files.
Google map of the walkDownload GPX file of the walk
I did this 12 mile circular walk on Sunday, 1st July, 2012. It was the reverse of Walk 1 of my Chiltern Chain Walk (this time I did it anti-clockwise), and starting at Bison Hill (Grid reference SP 999184) rather than Dunstable Downs (just to avoid paying for parking).
I started off walking very late, about 10.25am (I'd had a very long but enjoyable day the day before, moth trapping from 4am then going to a WildAboutBritain get together at Ivinghoe Beacon and College Lake). I went up the stairs from the car park on Bison Hill and took the bridleway running between hedgerows. I followed the bridleway for about a third of a mile, virtually to its end, turning left immediately past a bungalow on the left. This led uphill through a couple of pastures belonging to the Dell Farm Outdoor Activity Centre (external link, opens in a new page). I didn't see the Jacobs Sheep that are often here, but I did see Mel the Jersey Cow, Crocus the black Dexter cow and a herd of goats (which don't seem to be mentioned on the web site, presumably they are very new, certainly I've not seen them before). There were a group of children obviously enjoying themselves in the small enclosures behind the farm on my right. The path then led past Whipsnade Tree Cathedral and into Whipsnade itself.
Start of the bridleway from Bison Hill to Whipsnade
The bridleway from Bison Hill to Whipsnade
The path approaching the Tree Cathedral, Whipsnade