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I'm not familiar with this plant, so I looked it up. Apparently it's a common ingredient of green roof plantings, so it will probably be appearing more often as birds rip bits off.
I'm not familiar with it either, and it's definitely a cultivated rather than a 'wild' flower. I too looked it up - mainly US web pages, one of which boasts of the 'critter resistance' of the plant! Thanks for help, both of you. It's always interesting to discover something new.
Lat/Lng: 53.609, -2.30277
OS grid ref: SD800125