I am married to a Thai and hold a uk and EU passport. She was granted uk citizenship in 2008 when lived there .can she now apply for a British passport. 

Thank you.

Yes, she can apply for a UK passport. 

She will need to present her Certicate of naturalisation.

It is also possible that she will have to attend an interview in person or by video call as it will be her first adult passport.

8 hours ago, blackcab said:

It is also possible that she will have to attend an interview in person or by video call as it will be her first adult passport.

Why - if she has the correct documentation.?

2 hours ago, pontious said:

Why - if she has the correct documentation.?

 

Here is the guidance from HMPO:

 

https://www.gov.uk/government/publications/interviews-overview-of-the-interview-process/interviews-overview-of-the-interview-process-accessible-version#:~:text=Adult customers applying for their,could not attend an interview

As the British Embassy do not issue or offer guidance on passports, this topic has been moved to the Home Country  forum.

She can get a UK passport. She will need to submit the original of the citizenship certificate, her Thai passport and also have someone verify her passport photo (normally a 'professional person' who has known her some years).  There MAY be an interview to confirm ID (can be done online).

Thank you for help here, except the British embassy.!