Just my opinion but the only reason the cross party opposition would call for a vote of no confidence would be if they had pre arranged to support a cross party executive with a fixed term leader. This would allow a practically seamless transition without a GE. The fixed term parliament would leave the conservatives with a large voting minority (purely of their own making) until 2022. If the coalition kept their eyes firmly on a well drafted deal, they could then hold a second referendum putting two options to the country …. Accept leave document, or repeal article 50.