The London Underground Piccadilly line to Heathrow will start its night service this weekend.
Passengers catching early morning flights on Saturday and Sunday will now be able to use the night tube to Terminals 1, 2, 3 and 5. There is no night service on the Terminal 4 loop.
The 24-hour service will run every 10 minutes between Cockfosters and Heathrow T5.
The RMT union has called for the launch to be delayed due to "on-going safety concerns" connected to wet leaves damaging train wheels.
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