LHR
Platinum
XFAR - Mercedes ML350 or similar
XFAR - Mercedes ML350 AMG line*
*Technically no upgrade, but I wasn't expecting one. The only bigger vehicle would have been the GL350. Nice drive. ML350 was fully loaded. Booked SIXT as this rental was one-third the price of what Hertz wanted. Overall, very happy: rental process took a bit longer than with Hertz (no vehicle pick-up at T2, bus to and from rental facility and a bit of paperwork and no drop-off back to terminal. Added time total on both ends about 45 mins) ... but for big savings!