Where in the uk , can u buy spanish moss?
Spanish moss is a pest here in Florida and a threat to our old oak trees because it holds moisture and will rot limbs deprived of sunlight. It is unlikely that you could make it grow and survive in your part of the world. It can be used as a temporary filler around artificial plants, however, you will need to fumigate it first because redbugs and other unsociable critters live in it. After a while it will shrivel and turn an ugly grayish color.