If demand is high enough I believe Mike said he would entertain the idea of doing another run/ making them a permanent addition to the store; anyone with half a braincell knows what a CD does for handling, and looks/ symetry, so I imagine they will sell like hotcakes
Im tempted myself, though it it'll have to wait a while since I have a whole bunch of other stuff that needs doing in my flat that requires all my disposable £ for a while,