The Marsh Fritillary has the most colourful upper sides of all of our fritillaries, being a highly-variable chequered pattern of orange, brown and yellow markings. The bright colours fade after a few days and leaves the butterfly with a shiny appearance - early Lepidopterists naming this butterfly the "Greasy Fritillary" as a result. This butterfly is primarily a wetland species as its modern name suggests.
Is this a remnant population or reintroduction Ewan? Wonderful to see and presumably has Scabious as a food plant?