Transport for London confirmed the new ‘night tube’ operation yesterday with services starting on September 12th.
From that date, the underground will operate all night on Friday and Saturday evenings.
Full details can be found on the TFL website here and there is a new night tube map (click to enlarge):
From a HFP perspective, the most important bit of news is that the Piccadilly line will be operating from Cockfosters to Heathrow. There will be no service on the Terminal 4 loop but trains will run to terminals 2, 3 and 5 every 10 minutes throughout the night.
This opens up a few possibilities. It makes it easier to book a very early British Airways departure on a Saturday morning, knowing that you can get to Heathrow without incurring a chunky minicab fee. Late arrivals back into London on Friday and Saturday evenings also become a bit more attractive now that you are certain of getting home, even if your flight is a little delayed.