article_snippet: On the day in question in November 2008, Detective Sergeant Colin Helyer had been called to Valerie Cadman-Khan former partner's home over an unpaid tax bill.
article_snippet: But Detective Sergeant Colin Helyer began 'banging' on the front door and later claimed the child had turned 'purple' because Valerie Cadman-Khan was not wearing a coat.
highlights_snippet: Detective Sergeant Colin Helyer arrived at property over unpaid tax bill .
  
highlights_snippet: But Detective Sergeant Colin Helyer banged on the door of property in Middlesbrough and 'lost temper'
  When Valerie Cadman-Khan arrived home Valerie Cadman-Khan was arrested and led away .
  