I happen to be in Scotland for the weekend, and the only hones I've found have been in photos, like this one from the original ScotlandsPlaces - Stair, Water of Ayr and Tam O'Shanter Hone Works, Whetstone Roasting And Grinding Mill Whetstone Grinding mill responsible for the Tam O Shanters and Water of Ayr stones.
If I'm not mistaken, the middle photo shows a stack of several hundred whetstones ready for the kiln.