Re: NPPL to JAR-PPL
Yes, the qualifying cross-country flight is longer, you will need to learn radio aid fixing and tracking and you will need to have achieved the right number of hours for dual and solo flying, including navigation. The JAR-FCL PPL Skill Test includes navigation, whereas the NPPL NST and GST are flown separately.
Don't forget that a JAR-FCL PPL(A) has a £159 initial issue fee and lasts for 5 years before a reissue fee of £63 has to be paid.
Whereas a NPPL has a £45 issue fee and lasts for life.