G-APMM was owned by the Historic Aircraft Museum at Southend dutring the 70’s. It was never restored for display as one of the museum directors bought G-ANPE which was often in the museum when not flying and we also had G-AGYU on loan from Tony Haig-Thomas for a long time.
At that time G-APMM was kept in one of the hangars on the airfield and was a complete but dismantled airframe still covered and with Bustard Flying Group badges on the cockpit side. The museums unrestored Stampe F-BDFE alias G-AYHV was also in the same hangar.