Justice Secretary Chris Grayling has said he plans to fight "for every penny" that the Ministry of Justice was allegedly overcharged for electronic tagging services.
Earlier he said that a government-commissioned audit suggested that the incorrect bills ran into the "low tens of millions" and that he would take "all necessary steps" to get a refund for taxpayers.
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For the second year running, Sandbanks has been identified as Britain's most expensive seaside location.
It will be drier and brighter in the south, with temperatures remaining high.