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Comment by Helen Nock on July 15, 2012 at 12:36

Found it:

Volucella zonaria also called the hornet mimic hoverfly, is aEuropean species of hoverfly.^[1]

In Great Britain it was only known from two specimens prior to 1940, and so was regarded as rare. Since then it has become increasingly widespread in many parts of the South and South East England, often in association with parks and gardens where adults are usually seen visiting flowers. Elsewhere in England there are only a few scattered records.

The larvae live as commensals in nests of wasps of the genusVespula. Like all Volucella the adults are migratory.

Source http://en.wikipedia.org/wiki/Volucella_zonaria