Thanks - it looks like what I've got is at least fairly low grade. Having roasted them again they've come out far more consistent, although still don't have the same rich aroma as the Blue Mountain coffee. Looking at the links you've provided and others on the site they look like grade 5 greens.
The "very pretty greans" look just like the Blue Mountain greens I bought from Hasbean which I also roasted today, and which smell 100 times better than what my colleague brought back for me. I'll grind them up and see if they taste any good, not least because I promised him I'd take some in for him to taste.