Ebay item no. 170302047476.
Have a look.
It's old rusty and mucky, but looks largely saveable... should look something like this photo I guess.
Anyone know where to get engine spares if I need them? From experience, I'd expect the carb to be full of gunk and the rubbers and gaskets to all need replacing... I guess the crank seals might not be too happy either, even if everything else is perfect ... (he said, hopefully, but not very optimistically!)