<span style="color: #222222;">A London authority has asked the police to find out if Prime Minister Boris Johnson had a criminal link to an American businesswoman who allegedly got favourable treatment from him when he was mayor of London.<br />'' <br />'' The Greater London Authority recorded what it called a conduct matter against Mr Johnson. The Independent Office for Police Conduct will consider if there are grounds to investigate him for misconduct in public office.<br />'' <br />'' The authority said yesterday that it had a statutory duty to record conduct matters pertaining to the mayor in his role as police commissioner.</span><br />''