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20th April 2016
12:40pm BST

via Giphy / GoofyGIFs[/caption]
The only strict rule is that all members of the group must travel together for both the outward and return journeys.
Apparently the offer has been listed on National Rail's website since May 2014. The group maximum is nine people.
Participating train companies include, but are not limited to: Abellio Greater Anglia; C2C; Chiltern Railways; Great Western Railway; Gatwick Express; Great Northern; London Midland; London Overground; ScotRail; South West Trains; Southeastern; Southern; Stagnated Express and Thameslink.
View the deal page here and ineligible trains are listed here.
It's cool, you can thank us later.