Yeh even here out in the moors it is a real problem. Locals go round picking it up but really shouldnt have to ands a lot of it comes from walkers who you would think would be more responsible. If I was in charge What I would do is, given that every package has a bar code on it, create bins which scan rubbish and enter people into a lottery for each piece they put in. You would then get lots of people purposefully gathering up as much as they can to enter. Not goign to happen though.