High Quality Content by WIKIPEDIA articles! Henley is a county constituency represented in the House of Commons of the Parliament of the United Kingdom. It covers south Oxfordshire, including Henley-on-Thames. The constituency elects one Member of Parliament (MP) by the first past the post system of election. It has long been a safe Conservative seat, and the current MP is the Conservatives` John Howell. The best-known past MPs were Michael Heseltine and Boris Johnson.