Well (you started it fisrt) if yours is so small ..... I bet it doesn't need any help to get up (must be permanenetly standing) and also should consume less. Don't worry though Keith from what I heard lately size doesn't matter
FYI mine however, is toooooo big and needs some assistance and support and it also consuuumes toooo much (fuel I mean)
Seriously though for small engines , as you said, 2-stroke should be the engine type (I think).
However, from what I know in Switzerland for example in the lakes they do not allow 2-stroke engines any more (big or small). Is it the same in the UK?? or the law hasn't arrived here yet for implementation??