You need to make sure you have Heathrow express if your to stand any chance

The best i have ever done it, is when i got back in from Canada at 6.30am, i got from the plane to the Heathrow express terminal in about 40mins, then by the time i got across London to Liverpool Street that was another 1hour and 15

Posted By: Derek Acorah, Feb 28, 22:20:08