Sillohed: Thanks for the details. Several images of World Wide's aircraft show them on the Decca ramp at Biggin and it is doubtless, as you say, that cooperation existed.
Having presented a fixed-float 47 from the 60's, it seems only fair to balance this with a contemporary craft from the same period:
Trans World Helicopters Hughes 300 EI-AOU at Blackbushe Airport in September 1966 (Photo: Peter Brown)