You clever man. Yes it was, though I'm sure it was on here too. Especially like this one
http://i145.photobucket.com/albums/r214/stevehartly/NeoFlintSlateMesoFlintallhousingnot.jpg
Maybe it's not an arrow scraper. But they're so similar to each other it must have been for some common activity. Surely. For working something or other for clothes or baskets or weapons or processing food or something.
I mean actually I don't know anything. But it was Ray Mear's total recognition of a shaped scrapery thing that convinced me they must be for something.