My car insurance was due earlier this month. I never, ever renew car insurance with my existing insurance company as there are always better deals to be had as a new customer. Loyalty to service providers does not pay, but what did pay was using a Topcashback link to purchase online direct from Aviva Car Insurance.
The amount of cash back I earned from TopCashBack was £70.70 for buying a fully comprehensive insurance policy that cost just £174 in total. So in effect I got 12 months car insurance for a little over £100. By the way that is on a 2.3 litre Ford Scorpio.