I just heard from Steve Bradley at ValueSelfDrive in Oxford that they are no longer doing car rental. :-(
So we are opting to take The Airline bus from Heathrow to Oxford and then pick up a rental car there and drive it around the Cotswolds. We thought that would be less stressful than driving from London. The bus has free wi fi and plug ins and leaves directly from Heathrow, making our connections easier too.
Thanks,
Nancy Rooker