Everyone thanks for your input!
Jetz your answer sounds good but if you lose AC power on start your going nowhere except back to the stand plus your on APU power so TR3 would already be powered, right?
As I see everything is pointing to engine 1.
APU bleed is closer to engine one.
The Headset jack is on the RHS allowing engine 1 to be clear on the push.
The GPU and Air cart is on the RHS.
The only thing that is on the LHS is the punters but then again you wouldnt start the engine on stand with people boarding, and the airbridge is well out of the way on push.
May be its just a Boeing thing and Airbus copied
