ooh, I just bought an eryngium but it's the silver veined leafed one so very different from this but if it is, then that would make sense. I remember being very excited that I'd found [whatever it was] and I've wanted eryngium to complement my silver/lilac bed (this has been planted near it). Off on an excited Google ...
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You're right, not a Cuckoo Pint (I'm on my laptop now rather than my phone).
I'd go with eryngium
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
PS
I'm glad you didn't pay money for Cuckoo Pint 
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
ooh, I just bought an eryngium but it's the silver veined leafed one so very different from this but if it is, then that would make sense. I remember being very excited that I'd found [whatever it was] and I've wanted eryngium to complement my silver/lilac bed (this has been planted near it). Off on an excited Google ...
see..... works out in the end