On page
76 'Monkey Boy' made an enquiry relating the the Marley Tiles Co. TwinEcureuil G-BMTC.
At the time of MB's enquiry we were only able to source an image of Marley's single-Ecureuil G-BHIV but, it is now possible (thanks to photographer Adrian) to see the craft in question:
Marley Tile Co. AS355F2 Ecureuil II G-BMTC at McAlpines 'Hayes Heliport' in 1984 (Photo: Adrian Batchelor)