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It looks good for oak, with those clustered buds, but I don't know if it's possible to easily tell the difference between Quercus robur (English Oak) and Quercus petraea (Sessile Oak)from winter twigs - or the 35 plus other planted oaks (I looked in my trees book - I had no idea there were so many exotic ones).
Good place for pictures of winter twigs: http://www.flickr.com/photos/63075200@N07/sets/72157629795978835/
Thanks for the link - really good. Yes, I thought trying to get down to species might be tricky for oak. i don't think its sessile as sessile buds are hairy (I think!) but of course, as you say, it could be so many other things! This is a planted tree on an old airfield site, with many others which look to be same variety and have been planted at same time.
Lat/Lng: 51.7699, -4.7535
OS grid ref: SN101115