Upgrading Class 2 to Class 1

[Northern Highflyer]

Can anyone help ?

I have my Class 2 which is due for renewal in November 2003. I know I can renew this from August 2003 as it is within the 90 day renewal period but I am hoping to take my Class 1 around the same time.

What I want to know is if I take my initial Class 1 in August will it be valid just until August 2004 or can I claim the "extra" 3 months left on the Class 2 so that the Class 1 expires in November 2004 ?

I suspect it will only be valid for a year and the Class 2 expiry date will not count. Can anyone in the know confirm this ?