"A car hire excess insurance policy covers you against most potential excesses that hire car companies could charge you for, including misfueling, key cover and cancellation cover. Hire car companies can charge £1000's for various excesses on top of what you have already paid for your car.
"If you hire cars regularly or want a policy to cover you for longer than 14 days, you may want to consider an annual policy to try and save some money."