What is the very best car service from Stratford Upon Avon to Heathrow Hilton Terminal 5 in Colebrook on Poyle Road? We believe it would be about the same price to take a cab then to do the train to Marylebone then Paddington to Heathrow and Hoppa to hotel. Also what specific companies out of SUA are reliable and a fare price? Do you add a gratuity to the cost of the cab or is that included? We have been quoted 125 pounds with Radio Taxis Service but don't know anything about them.