Abraxas grossulariata
Caterpillars munch on a range of woody shrubs including:
Caterpillars stay on their host shrub right through the winter and following spring. In the early summer they turn into a chrysalis before transforming into the adult moth.
There is even more about this species on the main Butterfly Conservation website
Magpie moths play ‘dead’ when handled, to put off potential predators.