This is purely poor management on behalf of the senior RAF managers. Without getting into a slanging match between forces in the RN the AFT is based around your report date. My OJAR gets written on 31 May and on 31 May I have to be in date for my AFT. You only need to do 1 a year (the clue is in the title). You can do it at any time of the year. For instance. If I did my AFT on 1 june 2007 then I'm not required to do another one until 31 May 2009.
You don't need to be in the UK to do your AFT, you can do it anywhere you are currently based. If there are no PT staff in or around your particular hole in the sand then thats not your fault. The RN manage to condy=uct the AFT when deployed.... how do submariners do it? (with bubbles)