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I think Mike said he got these from the Discussion Weekend a couple of years ago as Cyclamen x hilderbrandii, one white flowered and one pink, and he has them in his garden. In his book Chris Grey-Wilson says of x hilderbrandii ""...... unfortunately the hybrid origin of plants in cultivation often has to be doubted and some I have been shown as putative hybrids fit comfortably into the range of variation of ordinary hederifolium....."". I note that CG-W refers only to pink. Perhaps if the pictures are good enough one of the Cyclamen experts could give a view on these.
I assume, given the parentage, that the hybrid isn't as hardy as hederifolium?