The last of the World War One aircraft on display was the Bristol F.2B Fighter. The Bristol Fighter was a fairly long-living aircraft with production starting in 1917 and continuing until 1927, with retirement from the RAF five years later in 1932.
The aircraft was employed in fighter and reconnaissance roles - you'll notice from the pictures that there is space for two occupants, the rear occupant having a Vickers machine gun [the detail on these aircraft was amazing!].
On to the pictures. In the first formation picture, the Fighter is leading the 3 Se5a aircraft and after landing you can see the Se5a's and the Fokker D.VII in formation in the background.