We are going to be arriving at the Doubletree Hilton Heathrow later in the afternoon from an international flight (going back to the airport the next morning to pick up a Cruise bus). I thought we would go to Richmond Park to walk off some of our jet lag as it looks to be only about 7 miles away. However, if I use the London Toolkit----it looks like it would take almost 2 hours to get there using public transportation! Anyone have an idea what a cab would cost to get us there? Or do you have an alternate suggestion?