OK, here goes:
From:
http://www.nppl.uk.com/documents/NPPLXCREV07.pdf
To get an NPPL SSEA when you have a JAR SEP:
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CAA-issued JAR-FCL Pilot Licence (Aeroplanes) or UK PPL (A) to NPPL (SSEA)
The holder of a valid CAA-issued JAR-FCL Pilot Licence (Aeroplanes) or UK PPL (A) with SEP class
rating who wishes to obtain a NPPL (SSEA) shall:
a. Produce the CAA-issued JAR-FCL Pilot Licence (Aeroplanes) or UK PPL (A);
b. Hold a valid NPPL Medical Declaration or JAA Class 1 or 2 medical certificate.
It should be noted that any additional ratings attached to the CAA-issued JAR-FCL Pilot Licence
(Aeroplanes) or UK PPL (A), such as the Night Qualification or Rating, IMC or FI(A) Rating are not
transferable to a NPPL (SSEA) and the holder’s privileges will be restricted accordingly.
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For a JAR SEP to a NPPL Microlights, or indeed your new NPPL SSEA to NPPL Micro:
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4.1 Pilots with valid licences and ratings
NPPL (SSEA), UK PPL (A) or CAA-issued JAR-FCL Pilot Licence (Aeroplanes) with SEP Class
Rating to NPPL (Microlight)
The holder of a valid NPPL (SSEA), UK PPL (A) or CAA-issued JAR-FCL Pilot Licence (Aeroplanes)
with SEP Class Rating who wishes to obtain a Microlight Class Rating shall:
a. Produce the NPPL (SSEA), UK PPL (A) or CAA-issued JAR-FCL Pilot Licence (Aeroplanes);
b. Pass the Microlight Aeroplanes Type (Part 2) oral examination conducted by a Microlight flight
examiner. The examination shall include pilot maintenance requirements and conditions of the
Permit to Fly;
c. Hold a valid NPPL Medical Declaration or JAR-FCL Class 1 or 2 medical certificate;
d. Pass the NPPL GST in a Microlight.
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Your NPPL would then be valid for 24 months - it is an initial issue so whether or not you have done the reval hours doesn't matter.
Of course, your JAR SEP allows you to do all this, microlight and light aircraft, with no GST on micro, no £137 licence fee BUT with Class 2 medical.
If you can pass the medical, is it worth all the fuss?
Very best,
XA