A Guardian editorial argues the EU's proposed 'Made in Europe' rules, aimed chiefly at shielding European industries from Chinese competition, will disadvantage Britain and make it ever harder for Eurosceptics to deny that leaving the single market was a blunder. It says Andy Burnham, keen to find accommodation within the regime, faces hard bargaining on a treaty covering customs barriers, youth mobility, and carbon trading, while his Eurosceptic opponents stay silent.