just read on one website that if you have an NPPL (M) you can't fly more then 8nm from where youve taken off from.
The NPPL(M) comes in two flavours, light (15 hours) and full-fat (25 hours). The 15 hour course just teaches you to fly, with no navigation tuition, hence the range limits. The 25 hour syllabus is unrestricted. The full info
here