These included a Stampe SV.4 G-BXNW, which is flown by Biggles, and a Boeing Stearman G-AROY, which is flown by his arch-rival, von Stalhein. Both these biplanes are actually from the 1930s, as flying and maintaining actual WWI aircraft was considered prohibitively expensive.
The period aircraft seen in the background during ground scenes belonged to the Shuttleworth Collection. The Stampe was flown by Stuart Goldspink, while the Stearman was piloted by former WWII bomber pilot John Jordan.