MALE - Photo taken on 11/07/15 at Kensworth, Beds.
This is common throughout the UK, flying between May and June (or until August further north). It rests with its wings vertical, as shown below, and the male flies by day.
FEMALE - Photo taken on 26/06/11 at Thursley Common, Surrey
MALE - Photo taken on 11/07/15 at Kensworth, Beds.