Nice one Graeme...you let the others do all the work and jump in with the answer. Yes it is the Buryevestnik S-4
. Here it is at Berlin, with its tail in a funny position:
I thought it would go very quickly once the engine was identified. It comes up with it on Google when you do a search for the Blackburne Tomtit!
All yours mate.
Closing down now guys...catch you later.