1979 Duxford Airshow Cine film

Some more cine film taken by my late brother at Duxfodr in 1979, could be early 1980 though? Notable for the views of Sally B flying up the airfield at naught feet and of the lovely A26 Invader later lost at Biggin Hill. Looks like Don Bullock in the left hand seat and i reckon it was him flying the B17!! Also nice to see the Sea Hawk and TF956.