In the EU there are legal limits of 4µg/kg for total aflatoxins and 2µg/kg for aflatoxin B1 in cereals.  However, the moulds which produce aflatoxins grow best in conditions which are warmer than those generally encountered in the UK, thus aflatoxins are rarely found in cereals grown in the UK.  The MAGB has monitored levels of aflatoxins in malting barleys from successive harvests, and the levels found have always been well below these legal limits. No samples contained detectable B1.  Most samples contained either no detectable aflatoxins or less than one tenth of the legal limit. (source: Campden BRI-Nutfield)