We will be flying out of Gatwick to Venice. We are staying at a B&B on Ebury St and planning on taking the Gatwick Express to the airport. If our flight is at 13:50, what time should we plan on leaving London to leave ourselves enough time for the train, baggage check, security, bite to eat and then to board the flight on time?
Also, how long would it take to walk from the Lime Tree Hotel on Ebury St to Buckingham Palace? I'm thinking that the morning we leave, we might be able to walk up there and take some pics.