Please visit Minisiter of Foreign Affair’s website for most update and accurate information.
Ministy of Foreign Affairs(http://www.mfa.gov.tr/visa-information-for-foreigners.en.mfa)
You can apply for your visa online here at https://www.evisa.gov.tr/en/
**The Information below accurate as of 18/12/2017:**
**United Kingdom**: Diplomatic passport holders are exempted from visa for their travels up to 90 days. Ordinary, service and special passport holders are required to have visa to enter Turkey. Ordinary passport holders (British citizens) can obtain three month-multiple entry e-Visas via the website www.evisa.gov.tr. UK passports holders with “British National Overseas”, “British Subject” and “British Protected Person” nationality are subjected to visa and they can only get their visas from the Turkish diplomatic or consular missions abroad.