Yes, British citizens need a visa to enter Turkey. A three-month tourist visa is purchased at the airport (£10) at a special booth before queuing for passport control. For those visiting to study, work or stay in the country for more than three months, an application for the appropriate visa must be made within one month of arriving in the country. For further information you should contact the Turkish Consulate; for more information please visit: www.turkishconsulate.org.uk