some of the elements here have already been posted, however if you use them smartly enough extra savings can be made. The quidco deal only applies to new customers.
Here's the deal, first purchase RAC breakdown cover minimum £28 and recieve £20 quidco, so breakdown only costs £8.
After 5 days (don't know why 5 days) the RAC website recognises your membership number.
Next apply for your car insurance and get free upgrade to RAC plus because you are now an RAC member, also get £70 quidco.
The icing on the cake is that the RAC are also currently offering a further £30 cashback ontop of all this.
Only thing I think I should add is that once your policy starts they ask you to send proof of any no claims.