The Double Header did not take place in 2018 due to redevelopment works at Twickenham Stadium and has not returned.
At other times of year Twickenham is also used for regular season Premiership fixtures, such as The Big Game hosted by Harlequins at Christmas time, The Clash hosted by Bath and the Premiership Final in June, as well as international fixtures including those by the Barbarians, plus inter-armed forces and varsity matches.
It was also the first time since 2005 that Saracens, Harlequins, London Irish and Wasps have not all taken part in the event.
Harlequins chose not to take part due to the proximity of The Big Game 8 and were therefore replaced by Worcester Warriors.
There had been suggestions that Wasps would not take part, following their move to the Ricoh Arena, however they were announced as one of the away teams for the event at the fixture launch on 3 July 2015.