Photo taken 24/07/07 near Lavendon on Day 3 of the Milton Keynes Boundary Walk
I haven't actually seen this growing wild, but I came across two bright blue fields of it om the Milton Keynes Boundary Walk - apparently the oil from its crushed seeds is used in an anti-wrinkle cream. It does grow wild in Cornwall, the Isles of Scilly and a few other scattered locations. It flowers between June and August.
Photo taken 24/07/07 near Lavendon on Day 3 of the Milton Keynes Boundary Walk