Go to the Customs and Revenue site and that will tell you what to do. You need to download a form fill it in and return it to the revenue in the UK. The form needs to be signed bu the Maliye in Fethiye. Someone said that they used Asli, the translator behind the post offfice, to do the necesssary with the Maliye office. The pension should then be paid gross when the Inland Revenue inform the pension provider.It could take a couple of months to put in place.
yes you are right, this is a topic that has been covered in detail in the past. Put tax on pensions in the search facility and it will come up as pensions posted by honestjoe