Thanks everyone for the info. Interesting that the engine doesn't have a flat top piston as suggested by Don. It is definitely built to run on kerosene as it has a hot box that bolts in between the carby and the muffler. Great to find out that it was built circa 1949. Just a little bit older than me. Ha Ha. I will try and get some photos but, at the moment, there are bits everywhere.
Cheers,
Alex