My P1 seems to cut-out at 117-8mph, just like the fuel is getting cut-off. Anyone come across anything similar? Dealer cannot legally test. Back to Prodrive?

 

That sounds like the speed de-limiter has packed up. The dealer should be aware of this possible problem; my mechanic warned me of the symptoms when I was having a chat when I picked my car up. I'd guess a multi-meter test can be done on the unit to check it out.

 

Thanks. Service imminent so I may just have to try a blast up the M-way to check beforehand.