Well I've played around with temperature values in the MPS430 board. Managed to blow a mosfet, and burnt my fingers.
The heated bed MKII arrived after christmas and I've had it heating up. I found an old Dell PC power supply, and have rigged that to supply the 12V for the bed.
While just checking the forums, I came across these two posts. They offer more information on heated bed control circuits.
For reference in the circuit design, here are a few notes I've collected since Christmas.
Also since I keep losing this, basic circuit for Launchpad MPS430
The derived R / T curve with Wolfram Alpha
Linearizing R/T curve