Detective Daniel Minto from South Wales Police was one of the officers who trawled through the vast amount of data found on Ian Watkins' computer. He said the sheer scale of the operation was the biggest challenge and described Watkins' as a 'technically switched-on individual.'
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Chris Davies MP has previously said he made an "honest mistake" in the way he submitted the claim but said he did nothing wrong.
Sir Tom Jones will not be able to perform at Emsland Arena in Germany or Belvoir Castle in Leicestershire this weekend.
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