[quote name='SteveK' timestamp='1359551827' post='1956443']
I'm not sure that what you're after actually exists. There were British artists such as Caravan and Soft Machine, but may well be a little too Proggy for your taste.
Later in the 70s you had Bruford, Allan Holdsworth, Brand X etc but they may be a little too rocky for you.
Seems what you're after comes mainly from the States, as your list of artists would suggest. Not sure there are any British Jazz Classics, of the kind you want, from that era.
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I agree that most is going to come from the U.S. but there certainly were a few British Fusion classics of that era. Anything by Ian Carr's Nucleus, a couple of Gary Boyle LPs for example and there was plenty of musicians playing that kind of stuff around this period. I think that it just all got lumped into the jazz scene in the U.K. whereas the U.S. had it's own Fusion scene.
There may not be many LPs that could be classed as British classics but there is a lot still out there that maybe should have been classics.