I'm not sure moving this blackcurramt bush will be successful. I would,buy a new bush and take cuttings from old bush. You could be waiting for best part of next year to see if has transplanted well and then have to wait a further year, at least, for fruit. However, cut it back before you move it - to the ground - and then some of the roots. Plant bit deeper and water well. Good compost in with backfill too. If you can though why not get new bush or two?