Graham, I can create a Google map of our route this evening for you and anyone else interested. I'll post a link back on to this topic.
For the time being, here is the location of Chalkpit Lane... http://maps.google.co.uk/?ll=51.271582, ... 5,0.026565.
Slines Oak Road ... http://maps.google.co.uk/?ll=51.287849, ... 3,0.026779 . Amuzingly the road at the top is called Lunghurst Road or should it be Lunghurts Road.
Beddlestead Lane and Hessiers Hill ... http://maps.google.co.uk/?ll=51.30564,0 ... 7,0.026779 . We went down Beddlestead Lane and up Hessiers Hill (short sharp steep hill). In reverse Beddlestead is a very long and satifying drag up.
One we didn't do, but is a favourite of mine from my mountain biking days is Bug Hill. For off-roaders, try Butterfly Walk which is an even steeper bridle path running around the back of it ... http://maps.google.co.uk/?ll=51.299134, ... 2,0.006695
Take a look at the satellite views as well.