BEagle,
Thanks for that.
"... the date used for revalidation purposes shall be that of the earliest validity expiry date and the "12 and 24 month" periods within which the relevant flight experience shall have been obtained will be applied according to that date."
The example given is a bit neat, with two dates just a month or so apart.
But let us say that you had an SSEA valid from 1st January 2012, and sat a Micro GST in November 2013. This means you could, if you did a 60 mins total on a micro (not including GST, I presume) before the end of the validity of your SSEA around a month later, then you would have you NPPL SSEA and M revalidated immediately with a new validity date for both running from 1st January 2014 for 24 months.
So, in some respects, you would have "lost" c23 months of your M validity, but then you'd regain that - and more - when you revalidated your SSEA and M jointly.
(NB. For Heston, this is someone revalidating their Micro NPPL rating just a week after issue, no waiting until the second 12 month period - although, technically, you have "waited" since the second 12 month period is calculated from the SSEA date!)
Hope it is clearer than mud, and thanks to BEagle.
Now, what happens with the reval in the 2nd 12 months for micro and the final 3 months for SSEA that people also mention?