Technically we are all speeding already when standing still, the earth rotates at 1037 mph, it is also traveling through the solar system at 67,000 mph approximately. The sun along with the earth along with us is spinning aroung the centre of the Milky Way at roughly 438,000mph.
So we are all speeding through time and space in a relative way, just the ticket. So we could all argue with Mr Plod that effectively we are stationary relative to the universe relatively speaking. 😎

I'll remember that when I'm next up in front of the magistrate
Going back to means tested fines
Can't see it working
It will clog up magistrate court admin and will be extremely costly to execute
The middle man and women on a decent income will be hit hard, the wealthy will get away with it as income is either offshore, undeclared or in irregular dividends
Those on benefits will just default and keep coming back to the courts and end up settling for a £1 a month or something stupid
It will not work at all in my opinion