The London Double Header began in 2004 and opens the season of the English Premiership (currently sponsored as the Aviva Premiership), the top rugby union league in England. Two games are played consecutively at Twickenham, usually involving the 'big four' London origin teams of the Premiership, Harlequins, London Irish, Wasps (London Wasps until the 2014–15 season) and Saracens. Harlequins were relegated from the premiership at the end of the 2004–05 season and thus for the 2005–06 season Leeds Tykes (now known as Yorkshire Carnegie) were included instead. The same applied to London Irish in 2016 who were replaced. The matches form part of the regular season fixtures, with one team nominated as the home side for each match. Between 2008 and 2015 and the inception of The Big Game, Harlequi