I think people are missing some of the key facts here base on what has been posted.

1. Video evidence from user bragging
2. Witness Statement (guy next door)
3. Admission of guilt from bragging on these forums
4. IP address will be lisited for every post made.

How do you we know if the witness has said "I seen this fella roaring past our house at excessive speed and recognised the car. I later found this video of the car on the internet where he claimed to have done 140mph"

Also I dont think the guy caught is being fully honest here and is not posting up the full details, where did the 143mph figure come frome, that speedo only goes to 140mph and the police wont say well it went a little bit past 140mph on the speedo so its 143mph.