Historical version 4 of Heathrow Terminals 1, 2, And 3 Station (view current version)
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(streetmap)
(osm)
(gmap)
(bingmap)
(streetview)
Zone 6 Tube station on the Piccadilly Line.
Actually inside Heathrow Airport. There's a bus station here too, and the Heathrow Connect service also calls here.
OS X co-ord:
507549
OS Y co-ord:
175844
(Latitude:
51.470840
Longitude:
-0.451384)