I suspect we're getting close to violent agreement here IfItAint, I accept that the term "Pilot Maintenance" is legally specific - rather say "owner maintenance" which is safer.
I've had a hand in drafting all sorts of things over the years, including CAA's CAP733 (which is now horribly out of date), and various BMAA documents 'tis true (some of which are also out of date)
I'm curious about something here 'though - looking at the NPPL website it says that all NPPL holders require a biennial flight with an instructor, but my understanding from what's come out of the BMAA seems to say that this is not the case for NPPL(M) holders. Having been flying on a JAR licence since 2000 and keeping that legally current I may have lost track somewhere along the line, but there seems a bit of a contradiction somewhere.
G