As far as I know there are still some things you have to post in the UK, like sending your cut up old driver's licence to the DVLA and maybe you still have to post your V5 when you sell a car. OP might not own a car or drive, though, so who knows?

V5Cs have been online for 3-4 years now.

You still have to send back your cut up old driver's license, though I have my doubts that someone is sat there checking and cross referencing each one they receive.