I'm moving house - do I need to inform my insurer of an address change immediately?

I’m moving house in August from an urban to a rural address, some 70 miles away. My car insurance renewal is due some 19 days later. Would it be cheaper to let the existing insurance run to its end and...

Is it fair to be charged a fee to move my insurance policy to a new address?

I've just moved house. I told my insurer, Saga, and they charged me £42 for the change. Do you think this is right?

Can the DVLA take me to court if I never received the parking fine?

My sister has received a parking fine letter at her address even though I've not lived there for a number of years. She's sent it back unopened, can they take me to court if I never received the letter?