I can only help with advice. The NVQ2 is largely about site safety, protecting customer's property, and working methodically. Making sure you get loads of photos in. I "had to" take a photo of carrying a radiator on a sack barrow in somebody's garden while wearing my steelies to get manual handling in. Then I actually had to take it off the barrow and carry it up some stairs and through a door to get into the building, but the photo ticked a box.
You won't be expected to dismantle a tap that hasn't been serviced since 1970 to get a maintenance task in. Fairly simple stuff is adequate to get the qualification (but perhaps not to do the work you may end up doing afterwards, unless you do newbuild site work, I suppose, which I was never in the least bit interested in). I was tempted to use a cast-iron rainwater installation as part of my NVQ, but it wouldn't have got me any more points than the cold water storage cistern that I did use in my portfolio (not all assessors will accept a cistern: mine did).
What you do need to do is get it clearly from your assessor what he or she expects to see in your portfolio. Because there's little point taking photos of 12 cold water installations if the assessor only needs to see 2, but then missing out photographing a maintenance task that perhaps you needed to show.
