Interesting, I'll bin my pitot theory and go for......
Biggles turns final without gear. Caravan controller too busy reading Heat/Cosmopolitan/porn magazine and Biggles lands wheels up having not got a red flare. Pi$$ed off with ATC for not doing their job, Biggles dabs in a bit of left rudder, takes aim and then jumps out.
Of course, I could be very wrong.
(All comments completely tongue in cheek)