Conflicting Advice

We're thinking of ordering some bulbs and plants in the next month or so, and one that's caught our eye is Oxalis versicolour, or candy cane oxalis.

'Candy canes' by Tanakawho

Based on the catalogue entry, they're hardy, and flower over the winter, so we thought of them for hanging baskets in the front. However, my research suggests they may not be hardy, and opinion on when they flower differs (late summer to autumn; early summer; winter).

If anyone has definitive advice (preferably for northern England), it'd be gratefully received...