OK, here goes:
(but your instructors should also know this!)
You can get an NPPL rated for microlights on the Scone Eurostar.
(while the syllabus is a minimum of 25 hours, you will probably take more)
You can then do a minimum of three hours further training to add a Simple Single Engined Aircraft (SSEA) - basically, a light aircraft - rating to your NPPL (M).
---- if you did your NPPL (M) in 25 hours, you would also have to have 32 hours total time, so would need a couple of extra hours on top of the 3hrs minimum ------------
So you now have an NPPL (M) & (SSEA).
Until 2015, you can trade your NPPL (SSEA) for a EASA LAPL (Light Aircraft Pilot's Licence).
Then you can convert your LAPL to an EASA SEP (Single Engined Piston) - basically, a light aircraft.
Finally, you can then start to add various other rating to your EASA SEP.
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I run a microlight school in Scotland, and therefore know the transfer routes to be able to fly light aircraft - particularly those operated on a Permit to Fly and therefore outside EASA's rules.
How to progress from a LAPL to an EASA SEP, I am less sure about. Any competent GA school should know all the NPPL (SSEA) - LALP - EASAE SEP stuff.
Learning to fly at my airfield on a microlight can give a reasonable saving due to our lack of landing fees and cheaper hourly rates. Other airfields may differ.
I do often advise people set on a CPL as their end goal to simply start on a EASA SEP, so not to start training with us.
But if you are wanting to learn to fly for fun and possibly go for a CPL later, then the NPPL (M) route above may - depending on airfields and prices - prove a money saver.