As well as growing your cordon red currant and cordon white currant as traditional Redcurrant bushes, you might like to consider growing them as cordons. With a planting distance of just 18", compared to 4' for a bush, they are much more space economical and if grown against a wall, they are easier to net against birds too. Pruning is simple and whilst crops inevitably do not compare to a full grown bush, they are still very productive, especially considering the space they take up.
Redcurrant can yield in the first season.
Red and whitecurrants do not need the hard pruning that is recommended for Blackcurants and a framework of growth is left in place. Initially the leaders [main stems] can be shortened by up to one third to any outwardly facing bud. This has the effect of keeping the centre of the bush more open which makes the foliage less prone to disease and also makes harvesting easier. You will find the fruiting trusses in the centre of the bush will ripen more readily, and will be sweeter as a result of this type of pruning. This pruning should be done soon after planting. The following winter leading branches of the Redcurrant can further be shortened to encourage side[fruit bearing] laterals. At this stage any unwanted low branches can also be removed at their base.
By the third year you should have a well shaped and nicely branched bush. From now on the only attention is to continually shorten longer/main branches and remove any that are causing congestion, diseased, or broken.