Hi, well it looks like Iberis sempervirens to me, it has oblong, spoon shaped leaves, which your picture shows, are you sure you haven't looked at I saxatilis, which has linear, almost cylindrical leaves ?, Derek.

yes I also think it is a correct id.

Thanks. Not sure how it got to where it is but I will transplant it. I shall also take cuttings as my original in another part of the garden all failed in the past winter.