Last time I visited Heathrow Airport there was a short time limit on the free WiFi. Now it looks like that limit has been broadened to a more useful chunk of time.
According to the Heathrow website those who register to use the Wi-Fi service will get four free Wi-Fi hours.
Want more – and faster – Wi-Fi at Heathrow? Join their Heathrow Rewards shopping program – it’s free – and you’ll get four more free hours.