Not the easiest things to keep long term. I would imagine that in the UK, they would be very similar to the hedychiums grown in garden then brought indoors to die off for the winter.
They need good light, warmth and humidity, not easy to produce in a UK winter. Might be worth trying again in spring on a warm window sil and then growing it outside in a nice sunny spot once the risk of frost has gone.
Good luck, mine only ever reached about 12" high then just gave up.