@ajh79 Still not sure about the orangey-yellowy power light on the hub, but it works, so I'm happy.
You've almost certainly got a recycled Hub 3 returned by another customer. Usually any blood, baked beans or nicotine residues have been wiped off, but that appears to be the full extent of quality control. The prevalence of off-white, orangey, yellow, and (in my case) mocha LED's appears to be related to the cheap construction of the hub, and progressive loss over time of output from the blue diode in the RGB multi-colour LED package. VM will insist that this is normal and acceptable.