What's wrong with my blackcurrants?

[DarrellMakepeace]

The currants never ripened up and are now covered in this whitish bloom, looking like sad blueberries!

And the leaves are looking less than healthy even though I might expect some discolouration at this time of the year.

These plants are grown from cuttings off plants I had before moving house a few years ago. The parent plants were perfectly healthy.

I'm wondering if it could be a virus?