Did you buy as a bedding plant or a corm? I find that the bedding plants often go mouldy if they get too much water and if you water from above. I water very sparringly and try not to get it on the leaves. This year they are doing really well.
Hardy cyclamen or houseplant cyclamen?
or those that get sold around now for containers which aren't really hardy?
Those big ones aren't winter hardy outside. They're really houseplants.
The ones that are hardy are the little ones, e.g. Cyclamen hederafolium and Cyclamen coum
Hi Susan, the bright red flowers are the giveaway that it is a non-hardy type (almost certainly Cyclamen persicum.) Those are best grown indoors, or at least dug-up, potted and kept indoors well before the first frost. The hardy types for oudoor use are almost all pink/purple or white and have small flowers about 1.5 to 2cm in size.
Garden centres etc sell the large flowered non-hardy types as annuals so unless you dig them up and look after them over the winter they will die.