Thanks Citradia,
Disappointing, but at least it allows me to draw a line under that idea.
What would you suggest, as a nearest equivalent, that would grow in SE UK (typical winters just below freezing, hard winter few degrees below), that I could get hold of more easily. I have a Yuzu that is doing well, but I fancy something that is more like a 'proper' lemon if you know what I mean?.
Thanks for your advice