I will be at Gatwick Airport (North Terminal) during one of the Round of 16 of the Euro 2016.
Do you know whether there is any area there, showing live Euro 2016 matches?
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The Wetherspoons pub after security has TV screens
and it's hard to imagine they wouldn't have it on. You could ring them on 01293 569874 to check.
Alternatively you could watch it over the internet, wifi and power info here: http://www.gatwickairport.com/at-the-airport/passenger-services/internet-and-wifi/