The car wasn't his, he worked for a hire/lease firm IIRC. Apparently they were going to charge him for taking without consent but they dropped those charges.
TBH I was surprised that this was reported as the highest speed anyone has been caught at in the UK.
I'm pretty sure a few years ago someone was caught trying to do a 200MPH shoot on the M1 in a 1000BHP Skyline, but the police let him off coz he was Japanese