Found this on the underside of a Gunnera leaf

1887 Clouded Border Lomaspilis marginata
(Linnaeus, 1758)
Wingspan 30-38 mm.A delicate little moth, which can be disturbed from undergrowth during the day, but whose natural flight time is at night.The black and white markings show considerable variation in the wild.It is fairly commonly distributed over most of Britain, occupying woodland and moist localities, and flies between May and July.The larvae feed on sallow (Salix) and poplars (Populus), especially aspen (P. tremula).

Thanks to http://ukmoths.org.uk