london britain parliament discuss key european union withdrawal bill next week leader low house commons andrea leadsom say thursday amid concern government struggle manage divisions content bill heart government brexit strategy transpose eu law british law point britain departure bloc repeal 1972 act parliament make member lawmakers propose hundreds change bill enough back lawmakers within prime minister theresa may conservative party defeat government something would cause may major headache question ability complete brexit process nothing odd anything fear slight pause leadsom tell lawmakers promise would eight days debate bill say would start bbc report wednesday government might delay bill passage parliament next month political divisions bill already pass first stage legislative process expect face stiff challenge next debate criticise lawmakers say give government much power amend eu laws transfer onto british statute book others want safeguard ensure government walk away negotiations without parliament approval uk brexit bill schedule debate parliament next week