NPPL to LAPL
 

The more I research this the more I get confused, does anyone have the definitive answer?
on one hand it says
But then the CAA have

Quote:

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If you hold or have held a licence in the same aircraft category

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and there are other parts where it talks of crediting previous experience

so just what do you need to do to go from NPPL to LAPL? Whole PPL course, nothing much or just bits?

As its an EU Regulation, that is the place to look for the difinitative answer.
A National licence issued after 8th April 2018 is not eligible for conversion to a Part FCL Licence.
What are the options? Do a LAPL course which has 15 hours of dual training.
As this was published well in advance, anyone who did a NPPL after the sell by date didn't apply much thought to the consequencies.

You could use your NPPL as the basis for an FAA PPL. You'd need a few hours training and a test but you'd get an ICAO PPL which with a validation from the CAA carries more privileges than an EASA PPL.

Or just patiently wait until 1st January 2021, when it might well be that the UK CAA publish a regulation permitting a NPPL to be used to fly an EASA type in the UK. I don't expect they'll refer to them as an EASA type, though.
TOO

rudestuff

Another EASA change has slipped into the regulations largely unnoticed (but Whopity saw it, that's how I found out). Even a one year validation now requires a minimum 100 hours total time.............

My mistake, I was referring to a one-time declaration to operate privately in the UK specifically with an FAA certificate. Where are you seeing the 100 hours?

I should perhaps have been more specific myself. A validation for an FAA licence holder not resident here, or anyone from any other country with an ICAO licence. It's buried in SERA.