Nettle-leaved Bellflower (Campanula trachelium) as seen a couple of days ago in a Sussex hedgerow. One of my favourite wildflowers but I don't think I've included it in the diary before. 

 Curiously it's a difficult species to photograph. The flowers are of a particular violet-blue hue which the lens of the camera has a tendency to distort as too violet or too blue. The same problem occurs when photographing Bluebells. 

 I believe this has something to do with UV frequencies. The flowers may be "signalling" to insects on frequencies which cameras (and humans) don't fully perceive.