It is phacelia tanacetifolia. Thanks @rock_hen. Looking it up, I see its everyday name is fiddleneck phacelia or, for some, blue tansy. It’s used as a green manure, is loved by bees and survives temperatures down to -28°C.
The photos of photos that I posted were not good quality so I understand the cleome suggestion K67.
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The photos of photos that I posted were not good quality so I understand the cleome suggestion K67.