The penultimate station on the west end of the Piccadilly Line, Hatton Cross is the last stop before the line splits to Heathrow's Terminal 5 or Terminals 1-2-3 and 4. I've spent a good bit of time here in the past, since it seems that no matter which time I'm flying out of LHR, the train is always going the OTHER way!
It's Underground, so it's out of the rain and the cold. There is plenty of seating for waiting. Upstairs is a rather functional and boring building with waiting areas for the bus stations to local places and a good amount of room for dropping off/picking up friends. It might actually be easier to get here, compared to the regular places at the airport! I did spot a taxi stand.
There is no step-free access, which can be a challenge if you have heavy luggage. The station is in Zone 6. read more