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hhmmm, I meant Erysimum allionii, not sure what name it has added for me...
... that Erysimum allionii hort. is an nom. illeg., and gives Erysimum x marshallii as the correct name for this plant.
Thanks to you both for clarification.
Lat/Lng: 53.62932, -2.33874
OS grid ref: SD776148