Success! Okay, after much messing about and testing I found the problem. The reason there was no voltage at the connector to the fan was in fact the air con module that slots up the side of the ducting. I had initially replace the fan and replaced the control paneL and still getting the same result. However, the lights on the control panel was always flickering, the air con button didn't light up after pressing it nor the air circulation button. Went to the scrap yard as a last dich attempt to get it working, plugged in the new air con controller module and it all worked as it should, heat, air con, fan speed etc... it was it's little pain in the bum, but very easy to replace.