This is what Rick has on his site.
"Travel Guard CDW: Travel Guard sells renter's collision insurance at very affordable rates ($9/day plus a one-time $3 service fee covers you up to $35,000, $250 deductible, tel. 800-826-4919). It's valid throughout Europe, but some car-rental companies refuse to honor it (especially in Italy and the Republic of Ireland). If your car-rental company doesn't honor this coverage, and you have to buy other coverage to replace it, Travel Guard will refund your money."
We want to rent for a car maybe through Autoeurope for a week in France and maybe three days in England. I am concerned and a bit scared after reading the post on Italy and the fender bender, so want to make sure we have whatever protection.