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Ermine moth caterpillar nest?

Observed: 20th May 2011 By: vetandteachervetandteacher’s reputation in Invertebratesvetandteacher’s reputation in Invertebratesvetandteacher’s reputation in Invertebrates
P5201835
Description:

"Nest" of caterpillars on Bird-cherry. This is a relatively light year so far. Last year, the caterpillars more or less stripped the Bird-cherry bushes in the hedgerows. This doesn't seem to have done the trees much harm.
I added photos 2 and 3 a couple of weeks later. If anything, the infestation is even greater this year.
Photo 4 (added 2.7.11) shows adult recently emerged from the mass of pupae on the tree.

Identifications
Species interactions

No interactions present.

Species with which Bird-cherry Ermine (Yponomeuta evonymella) interacts