I don't think this is Gentian. I don't believe any variety has fur and the flowers tend to be more pointed. It looks more like Borage; it might be Phacelia (Campanularia?).
Bobflannigon I think you may of got it I've researched Phacelia (Campanularia) and think it's identical. Heaven knows how it's got where it's growing but I hope it does well it's beautiful. I think I may even pick some seed up for next year. Thanks so much.
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We're on clay here so never see them 'live'