I assume you're talking about the insured extended warranty rather than the AUC warranty (which runs for a year after you buy an AUC car)
I did mine recently and went for the 100 quid excess, without the breakdown cover, think it was about £700 for the year for the M. Not sure if you read the small print but the warranty (without breakdown option) still covers you for the assistance car and cost of towing to the nearest dealer, so if you don't want european cover, hire cars etc etc you can drop that.