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Echium vulgare
Small White was feeding in it.
Coastal marshes.
From the Oxford English Dictionary:
A bristly plant of the borage family, with bright blue flowers.
Anchusa and other genera, family Boraginaceae: several species, including the Eurasian A. arvensis and the widespread viper’s bugloss
Thanks arlanda, I agree and have updated the page. Did you know there are two completely different Moths which are also known as Viper's Bugloss!