Yep, looking off the side of Rodborough Common towards Woodchester and the Nailsworth valley.
Not quite sure what you mean with "cleaning up" the greens? you mean potentially looking to play up saturation of them a bit and a cooler colour temp in those areas?
I went to and fro on this a bit when editing the image, to me keeping the greens more subdued seemed to work better giving the picture a bit more of a unified feel with more emphasis on the curve of yellows/golds of the trees.
I've taken the liberty of cleaning up the colour channels via selective colour (image>adjustments>Selective colour, in PS2).
Select the red channel and reduce the black and cyan by the sliders. Then select the yellow channel and reduce the cyan, magenta and black and so on. How much you reduce them by is purely subjective and will depend to a great extent on the camera on which the shot was taken, start with 10 - 15% . I never touch the grey channel though, you'll see why. ;-)
Basically what you need to do is reduce the colours that should not be in the channel. Red is made up of yellow and magenta so take out some of the cyan and black, yellow is a primary colour so take out some of the rest. Best thing to do is try it for yourself and work out what suits you. I'm sure the techie lads will have a better explanation of what is actually going on, but it works for me.