I don't really see the navigation issue... why wouldn't you want to use RNAV as
primary navigation as lang as you maintain VMC?
Since apparently things always work a litte different in CAA-Land (VFR on-top, IMC-Rating,...) I can not talk for the UK
but at least in Germany RNAv is part of the PPL syllabus and after a couple of hours almost everbody should be
confident in flying/intercepting a radial?
maehhh