Schematic as per Kevin's request. Too late for him as he resolved the issue by himself but may be useful for others.
Picture of 4 pin molex connector added to the V3 Raduino for pickup of T/R (D7), +5V, I2C SDA, I2C SLD.
Please note that the Arduino was replaced and put on headers as I have a remote LCD display.
Source of SSM2167 module as per previous posts in this thread.
A friendly reminder that raising the mic drive was linked with a rise in spurs (plenty of threads of this).
73, John (VK2ETA)