The signing of Norbi leaves 9.11 for the final two places.
If, as rumoured, Richard Lawson fills the No.7 slot then there is 5.73 for the final rider.
Only rider I can see near that average is Lukas Dryml (5.71)
Similar thing happened at Reading some years ago when Ipswich won the league at Smallmead ... that time it was stones not bottles aimed at the Witches on their victory parade. IIRC Billy Sanders leapt off the truck, hopped over the fence and had a few , er , words, with one of the culprits.
Maybe its a BERKshire thing ?