Might be local, they had 3 in store this afternoon in Robroyston, Glasgow.
Available online, thanks Mart321.Link below, I cant get the url to paste in.
Best Authentic Naples pizza flour is called Caputo 00 tipo & Best Pizza sauce is from San Marzano d.o.p Tomatoes
both can be bought from Ebay seller called
many of us have been using them for awhile now and there great on the g3 ferrari ovens or real pizza ovens Plus they offer the flour in smaller quantities