I nearly recently had my car insurance cancelled because they asked me to provide my log book, proof of no claims bonus, and my driving licence, and I had difficulty doing it.
Don't have log book because it's a lease car, old insurer kept promising to provide no claims bonus proof but didn't, and I could not find my driver's licence (current one, of course I had the old one with my previous address on it) for the life of me.
To cut a long story short, I found ways around the first two, but there was nothing to be done about the driver's licence but apply for a new one. Which I managed to do on a website other than the official government one because sometimes I'm so dumb, it hurts. This cost me seventy odd quid (yes, I know) and then I paid for one off the official gov site too.
To make matters even more expensive, I was only renewing my insurance because my previous insurer had cancelled my policy because my bank card had expired and I didn't respond to their letters. I didn't respond to their letters because I had forgotten to update them with my new address, and the letters were being sent to my old address, until the guy who bought our old house brought them around one day.
Of course the insurers had my email address and my mobile phone number, but I guess using either of those was too much bother for them.
I now have to declare to every new car insurer I use that yes, I once had my insurance cancelled by a previous insurer, and according to every one and her dog, this will bump my prices up.
Tldr: car insurance is a rip-off