This step deserves its own post. Here I have photographed the correct orientation of the connection cables. While checking this step I found a load of erroneous photos (including one under the files tab on the HK website!).
So here it is. This is a Hobbyking V2 board connected to ESCs and a Spektrum receiver (incidentally, the older AR6100, not E, fits perfectly against the arm of the quad nestled among the top and bottom plates!).
The photo above shows the ESCs plugged in. Note the heat shrinked positive wires on three of the four ESCs as described in the last post. M1 through to M4 are numbered on the board, correspond these with the motors as per your chosen program. Note also the negative (black/brown) wire is closest the edge of the board.
And the photo above shows the correct orientation of the receiver connection pins. Note the negative (black/brown) wires are closest to the edge of the board again.
It is possible to power the receiver with only one cable and use another cable across the signal wires only
if the order of channels correspond!
The spektrum receiver channel order is different to the channel order on the board, so I went with individual cables.