And another point goes to Joao, as this is the 2CV-based special, built by John Wright, how also buult the eight-cylinder Leyland special as pictured. It took 18 months to solve, so very well done 
Typed by George (Cyprus) from John Wrights words that sits by me at this moment !!! John is my uncle im happy to say

who still lives in UK and occasionally comes on holiday to Cyprus... not Malta

from John's own mouth and my typing
"The engine is a supercharged 3-cylinder diesel 2-stroke. Each cylinder has 2 pistons coming together in the center to make compression , so no cylinder heads to crack, no head gaskets to blow " The engine was manufactured in about 1960 by Tilling-Stevens (hence TS-3 TS for Tilling-Stevens and 3 for 3 cylinders !) .. john actually has 2 brand new engines still sealed fromthe factory and about other 6 of them. !!!