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Mr. Osborne confirmed the policing budget will fall by 4 percent a year — part of an overall 23 percent cut to the Home Office’s resource spending. The Association of Chief Police Officers said Britain would have fewer police as a result.

In one of the most significant proposals, Mr. Osborne said the state pension age for men and women will rise to 66 by 2020, four years early. It will alter retirement plans for 5 million people, but save $7.8 billion a year once it comes into effect.