Pickup Location (airport, city, or ZIP code/postcode): LHR
Pickup Date and Time: 4/18 12.00pm (land at 11am)
Return Date and Time: 4/30 12.00pm (flight is at 2.30pm)
Vehicle Size Preference: Compact/Intermediate (Approx ford focus size, golf is ok)
Memberships (AAA/USAA/airline FFP/etc): Amex Plat US (will this be enough insurance coverage for a UK renta - I have no experience renting in the UK. I have no primary car insurance in the US. I also have a world elite MC (Citi TYP) which I understand may be better if coupons are involved)
Best Price you've found, Hertz or otherwise: $320 Hertz - prefer Hertz for the free spouse additional driver and also 4 hr grace period via Amex - but did find a Ford Focus at Dollar for ~$220 but its from the LHR Sheraton - how annoying is this to deal with for 2 people with a suitcase each?

Thanks for your help!