The retail price index (RPI) measure of inflation fell to 3.0% in November, from 3.2% in October, the Office for National Statistics said.
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A man, reportedly armed with a knife and a baseball bat, was detained close to the event and police cleared the area as a precaution.
A remarkably mild night
Thousands of people have gathered in the centre of Manchester for a vigil in the wake of the terror attack.