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It appears my fears were justified. It doesn't look like bullatus at all to me and is extremely vigorous with lots of little squinny flowers and setting loads of seed. I'm going to ditch it just in case it turns out to be hardy as I suspect extreme weedy tendencies. I dare say someone might be able to suggest an ID? I won't have the plant long enough to change the label however.....
Poul, Ranuculatus bullatus doesn't have a stem to its leaf.