Update thanks to @ajamedor with TID0917, cheers mate.
TIDSAVE gets you 6% off. TID4U gets you 5% off.
Usually you can get 10% off but I can't find any at the moment and all the others have expired.
Their prices are very competitive however I have never claimed from them; they have great reviews on Product Review though. I'm pretty disappointed TID moved their rental car insurance out of The Basics plan.
So this bargain is 4% off worse than the regular discount available?