Public sector net borrowing, excluding financial interventions, fell by £1.3 billion to £13.2 billion in August from the same month a year earlier, the Office for National Statistics said.
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The Orkney Islands took second place, followed by Rutland and Wychavon while last year's winner Winchester falls to fifth place.
The prime minister reached a compromise deal within Tory ranks in a bid to prevent a revolt over plans to write the Brexit date in law.
Freezing, frosty and icy again tonight as temperatures fall.