I just got my car insurance from Norwich Union yesterday - went through quidco for an additional £45 and it has tracked already!
They're giving up to £75 cashback on their website for new policies too! I got £15 as mine was under £220 - it is tiered.
Cheapest quote I could find was £150
Norwich Union price £163, less £15 cashback due, less £45 Quidco due = £103.