Jeremy Corbyn And Defence

"Going to war creates a legacy of bitterness and problems.

"Going to war creates a legacy of bitterness and problems. Let us be a force for change in the world, a force for humanity in the world, a force for peace in the world"

It was classic Jeremy Corbyn. He's made countless speeches along the same lines during more than 30 years on the back-benches of the Commons.

But he can't be dismissed as a fringe figure on the left of British politics anymore. These words came in the victory speech of the most important figure in Parliament's second largest party.

The Party which sent British troops into long wars in Iraq and Afghanistan has just chosen its most outspoken opponent of those wars as its new leader.

He is also known for being a leading opponent of Britain keeping nuclear weapons. That puts him at odds with his party's official policy, but he's not the only one and it's a policy he will try to get changed.

Mr Corbyn's election gives the Government an immediate headache. It leaves their hopes of getting cross-party agreement to extend airstrikes against IS into Syria looking forlorn.

Ministers must now decide whether they can build enough support among individual Labour MP's to counteract opponents on their own benches, or abandon the idea of a vote altogether.

The government will be less concerned about the impending vote on renewing Britain's nuclear-armed submarines, as it should get enough votes from its own MPs.

But it is worried that if Jeremy Corbyn were to become Prime Minister nuclear weapons would be abandoned, prompting the Defence Secretary Michael Fallon to warn "Labour are now a serious risk to the nation's security."

Almost 60% of those signed up for this Labour election clearly didn't feel the same way.

Much of Jeremy Corbyn's public image comes from his appearances at 'Stop the War' rallies more than a decade ago.

He's been branded a 'bearded leftie' by the press plenty of times, yet among his friends he counts the Conservative chairman of the Commons Defence Committee.

Dr Julian Lewis, a cheerleader for replacing Trident, told Forces TV this week how he has worked with Mr Corbyn to secure debates on the nuclear deterrent because they are both driven by strong beliefs, even though their beliefs are polar opposites.

On his website the new Labour leader says he argues for "a different type of foreign policy based on political not military solutions; on genuine internationalism that recognises that all human life is precious, no matter what nationality."

For the first time in years there is a significant gulf between the Prime Minister and the leader of the Oppostion on how Britain should relate to the rest of the world.

David Cameron will now have to face Jeremy Corbyn's alternative ideology head on at the despatch box, not from a far corner of the Commons.