> Does anyone know the registration of this spicy aircraft?
I don't.
I'm not sure if we're talking about the same aircraft, however I believe this aircraft may be based at ANR, because I've seen it stored in one of the smaller Flying Group hangars.
Interesting... Is it - by the way - allowed in Belgium to fly an aircraft without a (specific type of) registration mark on the side of the aircraft?
And, FYI, the colorscheme looked surprisingly similar to this one: http://www.airliners.net/open.file/0970900/M/