[7] The station box would be built by the British Airports Authority as part of the £200 million construction cost of the new terminal.

[8] London Regional Transport funded the construction of 2.5 mi (4.0 km) of new tunnels, the track and the fit-out of the station, at a cost of £23 million.

It is adjacent to Heathrow Terminal 4 railway station used by Elizabeth line services that travel through the newer mainline tunnel.

For passengers travelling to or from Heathrow Terminal 4, a shuttle bus was provided from Hatton Cross tube station.

In January 2012, free travel was introduced for Oyster card holders between the three Heathrow stations.