Ladybird4 said: I think it looks like Green Alkanet - Pentaglottis sempervirens. Bees love it but it can be a bit of a nuisance in gardens.
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Pretty...yes....BUT It is a complete thug and will take over huge areas if it is happy.
https://www.google.co.uk/search?rlz=1C1CHBF_enGB785GB785&biw=1920&bih=949&tbm=isch&sa=1&ei=FdQDW9v4JNDWgQbf7qKgCA&q=pentaglottis+sempervirens&oq=pentaglottis&gs_l=img.1.0.0l2j0i24k1l3.21383.28726.0.30382.32.19.0.1.1.0.129.1581.13j5.18.0....0...1c.1.64.img..19.12.1048...0i67k1j0i10k1j0i10i24k1.0.1-psLz_khG0#imgrc=HTK0HM0VTksrcM: