Downing Street says Sarah Helm, the wife of Jonathan Powell, "does not represent the government in any capacity". Police reviewing social media post by writer Sarah Helm, wife of Burnham's National Security Adviser Jonathan Powell. Key points and original sources are listed below.

• Downing Street says Sarah Helm, the wife of Jonathan Powell, "does not represent the government in any capacity".S1

• Police reviewing social media post by writer Sarah Helm, wife of Burnham's National Security Adviser Jonathan Powell.S2