As of 1st June 2022, Covid-19 entry requirements from UK to Turkey have been adjusted as follows…
All passengers arriving in Türkiye are no longer required to present:
- A vaccination certificate
- A certificate for recovery from Covid-19 in the last 6 months
- A negative PCR or antigen test result
(Requirement for filling ‘Form for entry to Türkiye’ was lifted on 3rd March 2022)
https://www.dailysabah.com/turkey/turkey-eases-covid-19-restrictions-for-travelers-from-abroad/news