Miles was more than likely tired from his half last week. And so what if Mays ran 8:20. Adam Sutton and Anthony Ford have both run 28:40 10k's and Nick Goodliffe a 13:54 5k but it doesn't mean there in that shape now. You seem to be basing the standard of the Northern's around the fact that Mcleoud was up there and McGlory was quickest. But McGlory is in bloody good shape and had a leg 1 advantage on a windy seafront, and Mcleoud is obviously in very good shape.
I bet Jason Ward, Nick Goodliffe, Anthony Ford, Adam Sutton, Phil mcGlory, Dave Norman, Andi Jones, Alan Buckley, gareth raven, and Matt Barnes will all make the top 30 times at the National and most of them will be in the top 15.