I'm in the U.S. and (fairly spontaneously) intending to hire a car from Hertz or Avis for about 5 days. I'm intending to pay for this with my UK Natwest Mastercard, and since I don't have any of the small-print with me, I hoped someone could advise whether this credit card will provide collision insurance, or if I should pay (a lot more) for the Loss Damage Waiver from the hire company.
I don't own a car in the U.K. so I don't have any existing insurance which might cover the rental.
Update: so it turns out that while the LDW was very pricey booking through the Hertz U.S. site, it was trivially cheap (~$2.50 per day) via their U.K. one, presumably because - as Peregrine points out - it's pretty much required for overseas bookers. This means I didn't really have to worry about it after all, but only after I'd found that the U.S. site wouldn't accept my U.K. card because I didn't have a zip code!