According to Belami Online, Derek Raser's casting happened in 2008. He left and returned last year for two three shoots (I think). His solo was released last August 2011. It was also last year that his solo as Alois Holba at William Higgins was also released.
Not Derek Raser related but something to look forward at the end of the month at Belami Online. I wish I was Colin Hewitt :)