Given these differences, not least on the European referendum, I would find it difficult to abide by the collective responsibility that comes with serving in the Shadow Cabinet. That is why Jeremy and I have agreed I can more effectively support his leadership from the backbenches. In particular, it is my view that we should support the UK remaining a member of the EU, notwithstanding the outcome of any renegotiation by the Prime Minister, and I cannot envisage any circumstances where I would be campaigning alongside those who would argue for us to leave – Jeremy has made it clear to me that he does not wholeheartedly share this view.