So, learned something new:
After some lengthy discussions with food manufacturers on why their gluten free foods were making people ill (in knowledge that 20ppm codex not for everyone), I made the interesting discovery that not all foods labelled at GF are even tested for gluten.
Wah????
So, Coeliac UK website states this: "From 2012, manufacturers have had to comply to a single threshold standard that is regulated by law, which means that a 'gluten free' label can only be used on products which meet the terms of this law." The single threshold standard is the 20ppm or below.
However, I've been told by a manufacturer that they are NOT required by law to actually test the product for gluten before labelling it GF, and can do so on their own decision that their product is gluten-free and safe, based on their own knowledge of their supply chain/assertion. To quote one such manufacturer: "As advised by the Coeliac society ‘The law does not specify that tests have to be done to prove foods are gluten free, but recognises that good practice will involve testing.'". I'm assuming they mean CUK when they refer to the coeliac society.
So, this, from my perspective, is a massive relevation - codex 20ppm does not have to be formally tested for when a product bears a 'gluten free' label and testing is only deemed 'good practice' not actual legal requirement for labelling GF.
How is this even possible? Is that even correct?