I have Avis Preferred but would normally rent from Hertz as I am Prseidents Circle. For an upcoming rental at LHR however both Avis and Hertz are asking ridiculous amounts. I'm talking about GBP 700 (USD 800+) for a compact car for 4 days. Autoslash has come up with USD 250 using Hertz via PriceLine but when booking I notice it says "Driving License: USA". When I change this to one of my licenses (UK and Germany) the price doubles. Am I safe in booking as a US resident or should I find another deal? I have no problem with the US rate not including insurance as my Amex covers that.