Photo taken on 12/06/09, at Stoke Common, Bucks., on Day 1 of The Beeches Way
This is a common flower on heaths and moors (which is why I don't see it in the Chilterns!). It flowers from May to September.
Photo taken on 12/06/09, at Stoke Common, Bucks., on Day 1 of The Beeches Way