It’s crunch time for Labour. Empty posturing on Brexit will no longer do

Normally, an opposition could enjoy a week like the one that’s coming. It could sit back, relax and break open the popcorn as Theresa May walks into a Commons defeat on the policy that has defined her premiership. It could delight in yet more days of debate in which next to no one on the prime minister’s own benches rises to speak up for her, savouring the sight of a governing party that is devouring itself in full public view.