yes its Whipsnade / Bison hill. I even included a bit of the chalk Lion , and I thought the fence was a good clue - I think its its just an extra overflow fence in case something breaches the inner stuff, as that is just a field adjoining the road.
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It is also one of those Hills that if you ride up it you don't forget it.
@
Dogtrousers
I think like a lot of these entries, if you've ridden the road you can dredge it out of your memory very quickly , if not then its a more forensic trawl of google maps/ street view