Ribes sanguineum

I'm not sure if my Ribes sanguineum is a 'Brocklebankii' or 'King Edward V!!'.  I have had it about 4 years and pruned it hard last year.  It is a nice bushy plant now and the branches that have flowered are very showy but some branches have not flowered at all.  Is this because it flowers on old branches? I would be surprised at that because you are advised to prune hard.  I can't remember what I did last year so in pruning, which is due soon, does anyone know which branches I choose? Cheers