The Hawker Siddeley HS.1101 supersonic maritime patrol/ anti-submarine aircraft.
This submission was probably always an outside chance, Mach 1.5 burst speed, details are scarce but it was designed at Kingston so is a Hawker design team offering rather than from Woodford (Avro) or Hatfield (de Havilland). That probably explains why the commercial airliner version went no further either, this would have been one of a handful of post-war civil Hawker designs. The airliner was designed for sonic boom-less supersonic cruising and differs in a few respects from this military version. The airliner version will be my next project.