Posted: 08/03/2014 at 12:27
Dave, you will have a fare bit of hard work, but it is do-able.
First pick up and dispose of all the rubbish, mend the fences.
I would then spray with glyphosate (not sure about spelling) following the instructions exactly on the container. You will need to work out which size container to get.
Once you've done that, take more pics (they can be uploaded direct from a computer - press tree icon) then we can tell you the next move
Good luck with it.