In my opinion the NVQ is a qualification that has been totally perverted from its original intention.
The idea behind the NVQ was to give students with no academic ability, but some practical ability a bit of paper to say they could in fact do something.
comparison tables are given here
National Vocational Qualification - Wikipedia, the free encyclopedia
So you were no good at maths and illiterate, but could lay bricks you got a bit of paper to say you had an NVQ in bricklaying.
Somewhere along the line it's status changed, now it seems everyone wants an NVQ, all it shows is practical skills, it does not show knowledge of the underlying theory.
ie: with the NVQ the person knows how to practically instal a ring main, but has no idea as to why they are using 2.5 cable and a 32A MCB.
with the C&G 2330 they know exactly why they can use 2.5 on a 32a mcb, but have no idea how to chase out the wall.
So although two 2 qualifications where meant to be alternatives, the powers that be seem to think practice overrides theory.
Myself I think this is a dangerous approach, practice should be built on theory, not offered as an alternative.