Old realities thwarting Jeremy Corbyn's 'New Politics'

Jeremy Corbyn and his team were elected on the back of a 'New Politics'.

But the strength of ideas can be measured by how well they survive contact with reality.

So how are the New Politics coming along?

Well some of the ideas aren't altogether holding up:

Trident - Mr Corbyn wants to get rid of it. On Sunday Labour delegates said they didn't want to debate it.

People's Quantitative Easing - this morning shadow chancellor John McDonnell said this eye-catching idea would only come into play "at the right time in the economic cycle". A frontbencher from the last government told me even they had considered that.

Robin Hood Tax - Mr McDonnell still wants to tax financial transactions ... but only if the rest of the world wants to do it too.

Airstrikes in Syria - the kind of thing Corbyn would never agree to? This morning Diane Abbott, the shadow international development secretary, told me she could easily foresee British airstrikes in Syria if there was a UN resolution authorising them.

It's far too early to declare the New Politics a fatally flawed enterprise. But its fraying around the edges.

• The Robin Hood Tax - why is it loved and loathed?