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Airports by rail, with Holiday Extras, who I work for. I am not making a commission on this (damn).

To take benefit of the best prices you will need to prove you are a leisure traveller, on the way to the airport, so you will need to provide either yr flight details or yr holiday booking reference. I don't think you will need to provide this when you arrive at harrow-on-the-hill station but you may be asked to provide them on your travels from the station to luton airport.

Going to luton airport on the train is great, you can take a nap, read a book (even at night), play a game, or just gaze out of the window... The other restriction to buying these cheap train tickets from the station to luton airport is that there must be at least two grown ups travelling together. But another great advantage is that kids go free. All children under 5 go free, and then one child over five but under 16 per adult travelling by train to the airport.

be sure to leave enough time to get to the airport early enough to eat, shop and so on, so check the times of trains from the station before you go. If you have spare time at luton airport you can always read or play travel scrabble again! As you have bought your train ticket in advance, you don't need to worry about the opening hours of harrow-on-the-hill station.

Or maybe you meant

• Birmingham airport
• Glasgow International airport
• Gatwick airport
• Manchester airport
• Newcastle airport
• Stansted airport