It is not as easy if you receive a Government pension for doing Government work.
I have put a link to the UK/TURKEY DOUBLE TAXATION AGREEMENT
http://www.hmrc.gov.uk/international/Turkey-dtc.pdfARTICLE 18 refers to Pensions
ARTICLE 19 refers to Government service and the following subsection suggests that you will have to pay tax in the UK if you receive a pension for having done Government work unless you are a resident of, and a national of Turkey. It doesn't sound as if it applies to the State Pension but it does sound as if it applies to teachers or anyone else who has done work for the state so I guess that would include Civil Servants, the armed forces etc.
Of course, who knows how HMRC interpret their own gobbledygook.
(2)
(a) Any pension paid by, or out of funds created by, a Contracting State or a political subdivision or a local authority thereof to an individual in respect of services rendered to that State or subdivision or authority shall be taxable only in that State.
(b) However, such pension shall be taxable only in the other Contracting State if the individual is a resident of, and a national of, that State