I have.
Reason was that I started with microlights, and NPPL is the only ab initio route these days, I believe. With that licence rating (or endorsement), I went on to SSEA (SEP in old money) in about 14 hours, and the crossover was very easy.
I also knew that the move to JAR would be equally straightforward if I choose to do it in the future, subject to medicals, and some more tuition and testing.
CG