Update: So I have now fitted both fans to the Cytron MD10 motor shield, with fixing both fans to the A&B terminals (meant for one motor control)...

@gazzip so glad it has helped someone! I had almost given up when I found a bit of info here and there to piece together what I had to do, which was a...

Please check the tutorial here:/p> It explains the process/changes with the Arduino Uno Rev 3 and Arduino Motor Shield Rev 3.