This is Round Hill viewed from Castle Hill
And the opposing view of Castle Hill, an Iron Age fort - viewed from Round Hill.
The clumps are a haven for wildlife, including this Kestrel - trying to reduce the local field vole population
Apparently, 75% of Oxfordshire consists of areas of outstanding natural beauty and the clumps are probably the best place to see it, including the river Thames to the north of Round Hill
And the Berkshire downs to the south of Castle Hill - they can be viewed behind Brightwell Barrow (thanks Birdman):
Although, I suspect Didcot power station is probably part of the other 25%...