Thanks for the info Dan.
There are no marks on my engine, so I believe it is the VA Elfin 50 replica of 0.25cc, as imported by Dave Banks into the UK.
The engine was mounted to front of an Ebenezer type fusealage, which looked almost unused.
I have done nothing with the engine yet, looks mostly unused and generally very clean with some (I hope) surface oil stains on it, also is gummed up, which would seem perfectly normal for such a small engine left with fuel in it.
I will wait till the weather is warmer, before gently de-gumming with plenty of heat & fresh fuel, before trying to run it and then cleaning and some after run oil.

Thanks........Paul Harrison