Just an update on this one, got this all working today after a couple of days of headache!!!!
@VAG_David was spot on with this, had to replace two wiring looms in the drivers seats as well as the seat adjustment switch, the massage and lumbar etc was unaffected.
Changing the wiring looms was relatively simple once the seat was out of the car, observing airbag precautions of course. The one motor int he seat back is fairly easy to access if you drop the metal bar out of the way.
Two can wires need to be ran to the base of the seat, easiest way is from the rear seat.
Following this I had big problems which was a silly mistake on my side, I used a 'G' controller which is actually from a 3rd in a Q7, this did not work at all and gave an interesting error (for an S5) on the dash saying the seat positions in the 3rd seats were not correct. A good friend sent me an 'A' controller from an S5 Coupe and after a bit of recoding this works perfectly.
Thanks for everyone's input, hopefully with the help of @andyhud tomorrow the remaining retrofits (360 camera, PLA, Direct ) will be completed and I can get back to enjoying this car
Cheers, Andy