I wanted to change the address on my driving licence. I went through all of their hoops online-passport number, national insurance, previous addresses (although it insisted that one of the places I lived didn't exist, nor did its postcode - it's been there 500 years)
Then you have to enter a number offf the photocard, and one off the counterpart. After 3 attempts the it kept claiming I was entering the wrong numbers, then said you've made too many mistskes, you need to pay for a lost one.
So I posted it instead!