White Satin on Sorrell??

White Satin on Sorrell??

Observation - White Satin on Sorrell?? - UK and Ireland. Description: Caterpiller, 2cm, segments predominantly black with white, forming a stripe and red 'dot' on each segment. Many of this caterpillar observed on patch of ?Sorrell? growing on a bonfire site, on Coastal Lowland Heath (neglected, poor grassland with heath

Caterpiller, 2cm, segments predominantly black with white, forming a stripe and red 'dot' on each segment.

Many of this caterpillar observed on patch of ?Sorrell? growing on a bonfire site, on Coastal Lowland Heath (neglected, poor grassland with heather and gorse). Warm October day. Site sheltered by gorse and in good sun.

Nearest I can see is a White Satin moth but food plant is wrong.