Thanks bjay, I'm going with you and using cardboard with soil and compost on top.
Yes You're all right, it's bindweed I've got. I like the cardborad idea as I manage a cycle shop so no supply problems. Thanks to everyone for the help.
I'm about to make some raised beds on a patch of ground that has a problem with columbine. Should I use some landscape frabric under them to help with weed supression to?