You know what, I would be slightly gutted if you were allowed to race on Z rated rubbers
Nothing personal mate, just that the rules should apply to all in the same way...
For the little story, somebody called the New Era scrutineering people before the Donington round, asking them to check my bike's tyres and to fail it if it was wearing Z rated tyres. Which it was at the time (as openly disclosed in this thread...), but legal tyres had already been booked with Holbeach and were on their way. I would have just hoped that trust prevailed. I can be so naive sometimes...
So to cut a long story short, do not be surprised if only your bike gets its tyres checked at the next meeting... (that won't be because of me though
)