Ok thank you, it was suggested in in Plant id forum that it was some form of decaryi but not what form. But from the sounds of it there's no point knowing the specific form.
Just curiously as I have other variations, when growing these, is it fine for the leaves to look purple and closed up inwardly? These are the 'ribbed for your pleasure' sort of leaves, not the flat ones in the original post. Mine other ones have done that since purchase about 3 months ago and the plant some fine otherwise.
Thanks Baja, thats interesting!