The Airport Express is great but it can also make sense to take a taxi - it depends on where you are and what time it is.
When I lived in Kennedy Town we would usually take the train to the airport after work, but get a taxi straight home from the airport (especially on a Sunday) as it was a bit quicker than train+taxi and still reasonably priced if 2 or more of you.
Last edited by Ldnn1; Apr 6, 2015 at 3:57 pm