Dedicated SSD/HDD to install Windows on a MacBook
As always, feeling a bit silly answering my own question. But this was quite easy.

So I had two SSD's, one had Mac OS X installed on and was running fine. Because I was putting my second SSD in place of the super drive, but I needed the super drive to install windows-I first removed my Mac OS X SSD and put my to-be-Windows on in it's place.

So my machine had one blank SSD in. Inserted the windows disc to install, got windows on and updated. At this point I had a mac with just windows installed.

Then I swapped the super drive for my windows SSD and put the mac SSD in the main drive slot. From there just press alt on boot-up :D