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@gbj_tester
Some very fast times have been done (course Record 18:44 by Dr Hutch, AFAIK), but it isn't for fixed and I think the really fast times depend on high traffic counts as well as the net elevation drop. Whatever you ride, it's going to be quick compared with a sporting course, but there are plenty of flattish courses out there which are nearly as fast, just without the extra 15s you can pick up by riding on a busy motorway.