In reply to Mike Raine:
The Grim Wall ab is not 'approved' for this reason. But inconsiderate abbing is a real pain. We're pushing a 'look before you chuck' campaign. There are posters on the board at the bottom of the crag and in eric's caff and on the wiki.
Basically the local climbers decided they couldn't stop people abbing at the crag and therefore the don't ab policy was a sham. The 'approved' ab stations at the right-hand end have been placed to encourage people to ab sensibly and mindful of others. The Yogi one is/was especially useful as it doesn't really interfere with any routes.
Glad to hear it was there on Sunday and still being used and appreciated, who's the chap with the beard? What has he got to say for himself.
The BMC can't really approve abseil anchors of this nature but a large meeting of local climbers can and did. Plus three years in situ would suggest most climbers like them.