That's the one, TC!!!!! Another in my line of modified Cubs! Trevor has CONTROL
It does mention a lower wing, which is what he first said, but I guess there must be other references, maybe in Air Pictorial or similar, I'm busy at the moment and there aren't many about, so I'll wait and see if RR turns up and says what is is!
A sesquiplane in my book! - the lower wing being smaller than the upper!