A Chinese species, very recently arrived here (the day before the photo was taken).
It came from Plant Delights Nursery , and they have now confirmed that it is not
A.fimbriata, but in the absence of a better name, I have left it here with the warning that this name is WRONG.
It has grown well, but I haven't yet had any flowers to confirm it's identity.
I wish I had the time to key it out when I had it in flower! This does confirm that it isn't