Unknown blue flowered plant - Cuckmere - 21.5.2015

Looking at these three views, I was puzzled by this plant. I could see similarities with Viper's-bugloss, but the leaves didn't look the same and the stamens are pale blue rather than red. I use Sarah Raven's large tome 'Wild Flowers' for trying to identify wild flowers - strangely enough! No other plant seemed close. However when I discovered I had taken another shot with the buds 'unwinding' it looked much more like Viper's-bugloss as described by Sarah. www.ipernity.com/doc/philsutters/38271266 shows what I mean. The stamens are still pale blue, but there are touches of pinky-red around the buds.
As always I am very happy to be put right by people more botanically minded than I am.