Posted: 03/10/2015 at 16:33
I normally prune by cutting out the fruited stems to make picking the fruit easier and this produces a natural renewal cycle. However that clearly won't work in your case.
I suggest you wait till all the leaves have dropped and then take a careful look and cut out, as low as possible, any broken or damaged stems as well as any that cross others and rub against them. Then take out a third of the remaining stems to make n open, goblet shape if possible. This will allow air to circulate and rain to penetrate for a healthier shrub.
Come spring, give it a generous handful of blood, fish and bone lightly forked in around the roots and a couple of liquid feeds of tomato food to encourage fruit and flowers.
This should produce flowers and fruit next year..