I just plugged it in m8, was told it wouldnt need a code and it didnt.... it had already been updated and new maps added etc.... I didnt mess about with any wiring apart from swapping 2 wires for the iPod and it occasionally asks me for a code but doesn't follow any logic, ie after 2 weeks away it started up fine, but on a short trip to Sainsburys yesterday asked me for the code!!! I just reset it and its fine after 20 seconds or so...
mines the same dave. basically plug and play, and it occasionally asks for the code. reset and no probs.