My Scottish Glassmakers page on Scottish Glassmakers contains at least one sand-blasting engraver at Caithness, search on page (Alt +F3) for sand.
Should you come across any name/initial matches on Scottish Glass, please let me know for adding to this page.
Apart from engraving you can also get interesting graduated effects as in these
Lindean Mill graal cylinders.
<--- Mod: Dead linkI believe sand-blasting with sand is illegal in the UK now - but other material can be used. Does anyone know why and what?