See the contact details of the British Consulate General Istanbul. If you are in Istanbul then the British Consulate in Istanbul will be able to assist you with advice on marriage registration, applying for a passport or renewing a passport. They can also offer you advice on business in Turkey as well as provide you with consular assistance if you have been involved in an accident. They can also assist you with emergency travel documents if you have lost your passport while on holiday in Turkey.
British Consulate General Istanbul
The contact details for the Consulate has been listed below and you can contact them by telephone or in person on the street address provided. You can also email the British Embassy in Ankara for more information if the Consulate cannot assist you. If you are a BNO holder then you can also contact the Embassy about renewing your BNO while in Turkey. Each year thousands of British nationals flock to Turkey on holiday. Problems do occur so view the British Abroad leaflet for more information about Turkey and what you might encounter.
You can also see the Travel Advice for Turkey as well as the contact details for the British Consulate Antalya Turkey as well as the British Consulate Izmir Turkey. Always call the Consulate before you go there as you will need to know if they are open as well as what services they offer. They may be able to offer notarial services which would including administering an oath or an affirmation affidavit. There is also the ability to make a certified copies of documents. If you have a passport issue then see the article on How to Renew British Passport while in Turkey.
British Consulate Istanbul Office
Meşrutiyet Caddesi No 34