see what others say but from memory I don't think you could go wrong if you made it there for 10am to midday.
I will have to see how I pull up after the party, but provided I can ride right and weather ain't crap I'll be aiming for 11 ish...
Yes OK, I'm up for that @Chris . No Supersport though, but I'll go on something else ... M1 - A5 - Dunstable - MKeynes - Silly Sausage