Getting a quote takes about 5 minutes, but having the following to hand could speed up your quote.
Details of the car - The reg number isn't needed to get a quote, but you'll need it to buy your insurance. You'll also need to declare any modifications made to the car.
No-claims bonus (NCB) - Could give you up to 75% discount on your insurance. Generally, 5 years is the max NCB, but some companies do discount for up to 8 years or more.
Driving licence and convictions - The type of licence, how long you've held it and details of any speeding tickets, points or disqualifications you've had in the last 5 years.
Details of any other drivers - You'll need other drivers' names and licence details to add them to any policy.
Previous claims or accidents - If you've been in an accident or raised a claim in the past 5 years, you'll need details of the date, claim cost and accident type.