From time to time we see this question asked in the forums.
We don't believe there is a directory with a list of suppliers so will try to offer one here. Let us know if there is anyone else we should add.
Carnevale (1 stop shop with the whole range. Delivers around the UK)
Annessa (1 stop shop, now with a good wine list)
Prestige Food & Wine
Amato Food Products
Delitalia (Sells Petra flour as well)
Casa Julia (only for Caputo Flour, some pasta and tomato sauce)
Saviano Food Import
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