Inquiry launched into Peter Mandelson vetting leak, says Downing Street

• A government inquiry has been launched into the leak of information concerning Lord Peter Mandelson’s security vetting.
• The leaked details, which originated from a Cabinet Office briefing to Number 10, were subsequently provided to The Guardian newspaper.
• Darren Jones, Chief Secretary to the Prime Minister, confirmed the leak inquiry in the House of Commons during a debate on Lord Mandelson's appointment as US ambassador.
• Sir Olly Robbins, who was dismissed for not disclosing Lord Mandelson's failed security checks, expressed deep concern over the information being given to the press.
• Robbins described the leak as a 'grievous breach of national security' and called for a rigorous investigation and potential prosecutions.