I got the best deal from Ageas ( used to be Fortis) ... and never had to provide what you have all the years i have been driving.. ??
That's who I use Dave, cheapest by far.
Strangely, I had two brokers who quoted me different prices with the same insurance co. One obviously deals with them on a more regular basis therefore they get a much favourable discount.
It is better to shop around as your incumbent provider will always assume that you will renew.
Same with mortgages a different provider will nearly always give you a better deal as they want your business. They will then try to sell you additional services i.e. house insurance life insurance and that's where they get the money out of you from add-ons.