Macgavin's single malt whiskies
I agree that the Macgavin's Highland is the best of the lot. It is very likely that their lowland region whisky is Auchentoshan. I don't have any idea about the Highland distiller but my WAG is Tomatin. Macgavin's Speyside is okay and drinkable (definitely better than Speyburn NAS or Lismore NAS) but unremarkable. I haven't tried their Islay whisky yet. I recommend Macgavin's Highland and Lowland products as good and a bargain.