Purple Toadflax ( Linaria purpurea )

Yes, yes, I know it isn't purple, it's pink.  Some years ago we planted the purple version in the garden.  It has self seeded into various places but hasn't been a nuisance anywhere.  One year this pink version appeared.

There is a pink version on sale it is L purpurea "Canon Went".  However, this pink seems to be a self seed from the purple version as we haven't planted "Canon Went" and as far as I know there aren't any nearby.