The same two adults must travel together at all times, in both directions. Return ticket is valid for one month from the date of first scan. Valid between London Paddington and Heathrow Airport. Offer applies to Express Saver return tickets only with no upgrade to first class available. Offer cannot be booked on day of travel. Offer cannot be used in conjunction with any other promotion or discount. Railcards cannot be used to purchase this offer. Available for adult tickets only as children travel free.