Right Chris, I have the idea, never be afraid of asking as many times as needed, some one will know and it is what this forum is for.
Currants of any colour are shallow rooted, the best planting time between October and March although container grown ones can go in anytime. They hate bad drainage though if the soil is too thin they will have a short life. Enhance the soil with plenty of compost mixed with manure and because of the shallow rooting mulch often. A dusting of organic fertiliser in spring with some Potash added, keep well watered especially black currants.
I personally would not grow them in a container they could need staking, birds love them so netting may be needed, after a frost it pays to heel them in as they can lift.
Pruning, cut down to a few inches after planting so the roots can establish, there after cut out about one third of the last years wood in Autumn, red and white currants cut back around half of the old wood in winter. Cut back all the shoots to about one third after fruiting.
They can be high maintenance to get the best from them, who said gardening was easy?