Please be aware that on Sat 5th March, the Piccadilly line that serves Heathrow is partially closed, as is the District Line. So if I were you, take the Paddington Express train - it's quite expensive but a lot more convenient than a replacement bus that will get stuck in traffic. At Paddington, take the District Line direct to Fulham Broadway. After the match, don't use this station but go to Earl's Court. It is very straightforward, use a map or your phone and then reverse the journey as above. Paddington Express runs every 30 minutes and gets there in 15 minutes. Hope this helps and enjoy the game.