Verdun, you're right, of course, it should be in the ground, but at the moment there's nowhere suitable and hellebores tend to sulk if they're disturbed. The head gardener at Hadlow advised me to keep it in a deep pot if it had to be potted, and it's looking quite happy, in spite of being flattened by the recent snow.
For anyone interested in Kent or nearby, there are some open days at Hadlow College, Broadview Gardens on Sat/Sun 16/17 Feb, 23/24 Feb and 2/3 March. The gardens are open (and free!) all the time but open days have guided tours too, for £3. Some of the hellebore beds are interplanted with snowdrops and look great.