The left should carve out a new long-term narrative about British foreign policy: one that puts human rights and the protection of civilians centre stage again. And one that reasserts our commitment to the responsibility to protect those most at risk of mass atrocity crimes. This isn’t really about being pro or anti-military intervention. Rather it’s a call to redefine the principles that will guide the decisions we take, as well as a commitment to then honour them.

Unless we act to end the slaughter of civilians in Syria by President Assad, Isis will continue to find a steady stream of recruits from the Syrian Sunni population driven to desperation and radicalisation. In this context no amount of military action against Isis will be able to eradicate them. ... As long as these attacks persist these forces will not be able to focus – as many want to – on freeing their country from the cancer of Isis.

President Assad dropped chemical weapons on school children and the world stood by. He rained down barrel bombs and cluster munitions on hospitals and homes and we did not respond. For too long, the UK government let the crisis fester on the ‘too difficult to deal with’ pile. There was no credible strategy, nor courage or leadership – instead we had chaos and incoherence, interspersed with the occasional gesture. It’s been a masterclass in how not to do foreign policy and a shameful lesson on what happens when you ignore a crisis of this magnitude.

After the horror of 9/11 ‘interventionism’ was increasingly expressed through the paradigms of ‘security’ or ‘counter terrorism’, rather than being grounded firmly in the protection of civilians. And then Labour’s support for military action in Iraq distorted a worthy principle with such devastating impact. The legacy of Iraq – an intervention I was wholly opposed to because it was not fundamentally about protecting civilians – still hangs over us. But Labour can no longer be paralysed by Iraq. We need to learn from its many lessons without forgetting the equally important lessons of Bosnia or Rwanda.

I believe the left is now in a fundamental fight about our future approach to international affairs: one where we decide whether to channel UK resources, diplomatic influence and military capability in defence of human rights and the protection of civilians; or one where we stand on the sidelines frozen by our recent failures. I believe it’s time for the left to revive its ethical foreign policy and in particular, rebuild the case for a progressive approach to humanitarian intervention.

There is much to be proud of in the left’s internationalist past. Many from our movement made the ultimate sacrifice fighting Franco’s fascism during the . We were unequivocal in our opposition to Apartheid in South Africa, led action to protect civilians in Kosovo and . And we put this country firmly on the road to fulfil our historic commitment to spend 0.7 per cent of GDP on aid – an act of solidarity that has seen millions more children in school and many more women surviving childbirth. However, this active internationalist approach is not inevitable. It has been, and is still, contested across the . It is threatened by an increasingly nationalist and isolationist right, by a government that has withdrawn from global leadership. And it is threatened by those on the left who might show great personal solidarity with international causes but tend to think the British state has no role to play.

In recent years, Britain has withdrawn from the world. On Syria, on Europe, on Ukraine this government has been on the periphery: all victim of the same lack of long-term strategic thinking about British foreign policy and the absence of a moral compass. It is time for the left to revive its ethical foreign policy and carve out a new long-term narrative that puts human rights and the protection of civilians centre stage once again.

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Corbyn needs to show he’s ready to lead from the front. He and those around him must come out of their bunker, stop blaming everybody else, and show the discipline and determination to drive our message home. These elections were a terrible missed opportunity. We cannot afford any more.

When the voters tell us on the doorsteps that they can’t picture our leader in No 10 we have to listen. When our candidates in London and Wales ask the leader to stay away, we have a problem. When the revival we were promised in Scotland with Corbyn’s “new” politics proves to be a mirage, we have to ask what it has actually achieved.

Labour is in the doldrums and we have to ask ourselves why. Why, day after day during the campaign, we failed to get a hearing. Why the voters aren’t getting the alternative vision of a fairer, stronger, more just Britain that we should be offering.

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The Tories deserved a kicking last night. With chaos and discord in our hospitals and schools, an unprecedented housing crisis and fatcats lining their pockets while life gets tougher for everybody else, it’s an outrage for David Cameron to appear on TV looking like the cat who got the cream, knowing his party is on track to win again in 2020.