AAT for Accountant's Certificate of Confirmation?

[intahnetmonster]

I currently work under my own limited company, and am the only director.

I'm currently applying for my Indonesian wife to join me in London.

According to Appendix FM-SE, I am required to provide unaudited accounts for the last full financial year and an accountant's certificate of confirmation "from an accountant who is a member of a UK Recognized Supervisory Body".

I cannot find any list of what supervisory bodies qualify, so I was wondering if anyone here knows if an accountant with AAT would be acceptable?