Oh Cheers BaM! I'm going to keep working on the rest of her while I try and source a head. If it comes to it I'll just buy the whole mini on eBay and commit the rest of the parts to the bitz box.
I've never tried their metal medium, but I work mostly in Vallejo so I'll have to give it a try. Their Metal Colour for airbrush (and if you wipe almost all of it off, brush) is absolutely outstanding though. I've never seen metallics looks quite so good, and the dark metallic on the Inquisitor is the gunmetal colour. I'll get some good photos of it before I weather it down on the baneblade.