Starting when?
We're still waiting for the definitive AIC of course. However the above is the most often asked question that i'm currently asked.
My answer is that if you haven't changed over to the new system by the June 2009 but have remained current you will automatically go onto a 24 month cycle then, whatever. In such a case therefore you will not need to see an examiner until June 2011.
I'm then asked if the rules prior to the change apply until a formal change over takes place or June 2009 has passed. My answer is that as the new rules are effective immediately and to your benefit then yes they are applicable now.