Brain wasnt workin on the night. Couldnt get focus to start with, guiding was giving me troubles, etc..
In the end I shocked myself with thinking I'd taken shorter exposures and used a lower ISO setting.
Definitely going to attack this one in darker skies.
From LP Perth suburbia;
Canon 350 Baader UV/IR modded, 8" Newt
12 * 6min/ISO1600 lights
20 darks and bias, no flats