David Cameron and the 'self-licking lollipop'

David Cameron's eyes tend to roll skywards when Welsh media broach the issue of the assembly's powers.

He believes other issues are more important to voters than the constitution - and that we should commission a poll to find out if he's right.

When we met in Downing Street, he highlighted rail electrification to Swansea, a nuclear power station on Anglesey, a new prison in Wrexham.

But, I suggested, politicians keep talking about the assembly's powers. Only, he said, because you (the media) keep talking about them - "It's a self-licking lollipop".

What surprised me about his response to questions about devolution was that he focused more on the past - the 2011 referendum on law-making powers - than the future.

With a draft new law due to be published in October, I expected him to be more forward-looking. Perhaps it was jet-lag - he'd just returned from a trip Jamaica and the United States - but he was not his usual fluent self on devolution.

He did accuse First Minister Carwyn Jones of "playing politics", although, coming from one politician to another, it is a bit like a bishop accusing a fellow cleric of playing religion.

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Mr Cameron was more animated and fluent on the Rugby World Cup. How did the MP for Witney in Oxfordshire, who says he leads a "one nation" government, feel when Wales beat England?

"I'm an England fan," he admitted, "but I've got a Welsh grandmother. I've got Scottish blood flowing through my veins and recently I discovered some Irish ancestry too.

"The great thing about the United Kingdom is you can support all the home nations if you want to, I always have done.

"Not everyone, I know, always does. When they're playing each other I support England but I was delighted Wales beat Fiji."

After Saturday's English defeat to devolution, he'll be more grateful than ever to his Welsh granny.