The DVLA's computer system is perhaps the most frighteningly all-encompassing & efficient governmental control tool at work in UK, IMHO. Much more efficient than GCHQ, the second most scary governmental control internal surveillance complex in the UK.
Not only is it there to make sure you pay your road tax & have a license, but it's got everybody's insurance & MOT details on it, along with a photgraph of the ones who have photo licenses, home addresses, etc., so the filth can just scan your registration plate while following you & instantly find out if you're legal, every petrol station has numberplate-recognition cameras linked to it, every speed camera (again with numberplate recognition software) is linked to it, & it works like er, clockwork. Only better. As it doesn't work on clockwork. It's amazingly, blindingly efficient. & run by bloody Welshmen!
I know you anti-government types blither on about the SS & tax & surveillance, but to my mind, the quiet little DVLA, beavering away in its little slate-roofed terraced cottage in Swansea, is the most ruthless tool of the UK State surveillance system that currently exists.
Except in reality the DVLA Complex looks likes something out of 'Thunderbirds' or an early James Bond film's evil enemy's headquarters:

However, it is cool that I can retax my cars online just by inputting the registration numbers, & 2 days later a tax disc is delivered. Saves having to go to the post office & standing behind banks of stinking P*kis cashing benefit cheques for their 'mother/uncle' or sending money to Al Quaida.