Definitely excessive.

[redken1]

I'm obviously well out of touch but really, jail for speeding? I could nick your bike, ride it with no insurance and still get off with a small fine and points or short ban and would need to commit several similar offences (maybe dozens) before jail was a real liklehood

I think a lot of people would disagree on the basis that he was endangering the lives of all the other road users he encountered. It was not a simple case of speeding with a clear road ahead. He was switching lanes, weaving in and out of traffic at speeds in excess of 100 mph. As already stated by Dan he is one very lucky chappy.