If anyone is interested John Nichol put me on to UKGE as a source of abrasives. They are mainly for rocks and minerals but it’s the same stuff.
See the UKGE web site for details: https://ukge.com/product-category/lapidary-supplies/abrasives/
Or another bulk supplier in Germany: https://ots-store.com/ots-store-9070-14-en
Mike.
Update: Just heard from UKGE. Apparently they are winding down their business so won’t be supplying abrasives anymore!
