The significance of Angela Merkel visit

The chancellor of the most powerful country in Europe is in London.

Germany's Angela Merkel is addressing a joint meeting of parliament, having tea with the Queen and being buttered up by UK Prime Minister David Cameron.

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Media captionEmily Maitlis reports on the visit to the UK of Angela Merkel

He wants to keep her sweet because she is potentially his most powerful ally in his attempts to renegotiate the UK's relationship with Europe.

I looked ahead to the visit and examined its significance for Newsnight.