In reply to stp:
> I'm not exactly sure what one would expect the BMC to do
I wouldn't expect the BMC to take any immediate action, but it is something that they probably need to be aware of, if it's an increasing problem. As has been said, people might try to link this to climbers, and that might have a knock-on effect on access.
It's also politic if the 'governing body' of a sport shows that it has environmental concerns. I'm sure the BMC access officers work closely with other agencies, and it might be useful to point out that climbers are concerned about this sort of thing, and people like POD and kedvenc are taking steps off their own bat to tidy up and make good (kudos, chaps), again improving the image of climbers.