None at all as it was very thorough, the issue being that I connected up the UART cable at the AP end, feeding it trhough a vent hole and screwing the lid down, which must have pulled the ground connector away from the board. Of course, I didn't check that end :)
Perhaps my only suggestion would be "if you get garbage output, it's a serial configuration issue" could be added to the wiki?
Rule number 1 - Check the physical :)