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Via a promotion currently being run by the Sun newspaper, you can currently register for a free two month Family & Friends Railcard.

To benefit, you need to register via this link and enter the following 8 digit promo code: 3PL8 WG64.

Be quick, you have until the end of tomorrow at most! You must register for this offer online by 23.59 on 11 May 2016. A maximum of 125,000 cards are available on a first come, first served basis so the offer may also end early, depending on demand (there is availability at the time of writing).

Note that to use a Family & Friends Railcard, you must be travelling with at least one child aged 5 to 15 years.

The benefits of the Family & Friends Railcard are set out in full here, and can be summarised as follows:

• Up to 4 adults will get 1/3 off travel, when travelling with up to 4 children aged 5-15 (who will get 60% off).
• It applies to most rail fares (including the Heathrow and Gatwick Express: although given that accompanied children under 16 travel free on the Heathrow Express, this saving will apply only to the adult tickets (because 60% off £0 is not really a saving)).
• The card is not just limited to family members, but anyone travelling together (specifically, they “must travel with the Railcard holder throughout the journey”).

The full terms and conditions can be found here.