Holiday Inn London Heathrow Ariel and 15 days parking - Whether you're arriving by plane, M4/M25 motorway or even by train or underground from Central London, this hotel is very easy to reach. There is much to see and do in nearby Windsor including visits to the Castle, Great Park and the Household Cavalry Museum. Other local attractions are the beautiful Thameside towns of Henley and Marlow while for racing enthusiasts, courses at Ascot, Windsor and Kempton park are close by. *