" Rosebay willow herb"

Went to Norfolk to see my Mum this weekend, spent yesterday sorting out the garden followed by meal in the local pub!
I give you an Arty Farty "Rosebay willow herb", yes its a wild flower in Mum's garden but I know not to remove it along with any "Honesty" plants, Well that will get Botanical Boo googling!
Thanks for all your comments, I do appreciate them x