Worzey, that is the next thing on the list.
Curiously, it's a little more complicated than appears at first sight. You need an FPV set-up with camera rotation to get in close and maintain a centre frame of the target machine. You need a Gro-Pro for filming, preferrably on the same rotatable platform as the FPV camera. You need the FPV on 5.8 GHz so it doesn't get interference from the 2.4 GHz trannies of other club members. You need a camera plane fast and stable enough to catch up and track with the plane to be filmed. Hmmm.