A senior director at Huntingdon Life Sciences, the animal testing company at the centre of a Home Office investigation into animal cruelty, has resigned from an independent board which advises the Home Office on animal protection. Dr David Christopher, Huntingdon's research laboratories director, has stepped down from the Animal Procedures Committee, a body of 19 people which advises the Home Office on science, industry and animal protection. Dr Christopher has been under pressure from animal rights groups to resign after the Home Office threatened to revoke Huntingdon's licence after it upheld allegations of animal mistreatment exposed in a Channel 4 documentary earlier this year. A spokeswoman for the National Anti-Vivisection Society said yesterday: "He has finally bowed to pressure. His position was untenable." Dr Christopher is believed to be on an extended holiday and was unavailable for comment.