Strange bugs on Blackcurrants

We have some wierd things living on one of our blackcurrant bushes! I have enclosed the only pjhoto I could find of it on the web, but it had no discription, so am still in the dark.
It looks abit like the shell of a wood louse, but under it is a thick lump of what appears to be white gloop, but when it is disturbed, the white bit pulls out like sticky silk/candyfloss fibre.
Any suggestions, eradications, and if there are any natural predators we can introduce instead.
ThanX Glenys Sheffield UK
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Glenys

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Glenys wrote:

The photo isn't very close but from your description I would say mealy bug. You need a contact insecticed with a soap or detergent to get through the goo or a systemic as they are sap suckers. On a small plant, eg house plants in pots, you can get them with a cotton bud dipped in metholated spirits. Apparently there is now a natural control agent Verticillium lecanii (a kind of fungus) but I have never used it and I don't know what name it is marketed under. Perhaps ask your local nursery.
D
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Glenys said:

attachmentid011|

Hard to tell as the photo is small, but I am thinking it's cottony cushion scale.
http://www.ipm.ucdavis.edu/PMG/PESTNOTES/pn7410.html
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Pat in Plymouth MI

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That picture seems to be from this thread: http://www.kitchengarden.co.uk/forum/viewtopic.php?p 661
Guesses there are scale and wooly aphid.

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