David Cameron being offered watered down 'emergency brake' on migrants by Brussels

Charles Grant, director of the CER, said the deal, on the face of it, had the makings of a workable offer for Mr Cameron, but that its worth would depend on the details of any agreement."Given the current state of the negotiations, the British side would probably be happy to accept a deal that includes a four-year 'emergency brake' on benefits," he said.

"But the devil will be in the detail - the question is who will have control over the brake, under what conditions can it be activated, and how quickly could it come in to force?"