The original Series1 Heron had fixed gear and two bladed fixed pitch props.
Prinnair that operated 25 plus Heron's in South America had Continental TIO-520.
Don't forget the Saunders ST-27 Heron, with a lengthened fuselage and the piston engines replaced with 2 PT-6's.
But nothing beats the mighty Airfix Heron complete with Shell VIP flight or for the RAF VIP Fleet.
Did Max Langshaw fly the Herons for Kendall's?