The Courtney brothers have no fear. There are tales of them averaing 70mph on the 315 mile journey from Berwick when they rode for the Rockets in the late 80's.
*edit* My PB is 63mph, but that's leaving at 4am with a couple of stops .
In that case, you should be forced to track another British three pointer at 7. If Ged Rathbone is as astute as you claim, he'll have no bother finding another.
Watts averaging below 6 in the EL, which is virtually the PL with a few top class riders sprinkled about. He'd struggle to average much over 8 in the PL