In the meantime I've got another restoration project on the go:
I found this ancient Master of Signal whilst trawling through Ebay, caked in about half an inch of paint, meaning nobody was bidding on it. Never one to pass up a bargain, I bid a quid and forgot about it. Five days later I got an email from Ebay saying I'd won the auction. Result!
The paint came off with just half an hour in the Power Spray, leaving me with a rather nice classic miniature to add to my Sons of Horus. I'll be painting him up at some point, although I want to finish up my Reavers first.