Northern Ireland Protocol Bill

I have listened intently to the hon. Member and I am left confused by what he has to say. As I understand it, the dual regulatory system is a voluntary one, so what is to stop the co-operatives, which dairy farmers are part of, voluntarily agreeing to follow EU regulations under this system and abide by EU rules? The farmers are sending the milk in tankers to be processed in Monaghan, so it is processed within EU territory. What happens between the milk’s leaving the farm and its arriving at the processing centre in Monaghan that makes that milk incompatible with EU standards?