Thanks for all the advice!
What I’ve gathered from IIS, other sites and word of mouth is that the increased aperture probably isn’t going to provide much benefit in the ‘burbs but will provide brighter images of the DSOs I’m after at the cost of mobility.
I’m still not 100% decided but am leaning towards the 12” essentially because I am fairly well equipped and used to moving painfully large objects. I already have a trolley so rolling it out of the house into the garden shouldn’t be too painful and measuring the Camry wagon deems it suitable for my intended monthly excursions to darker sites.
I have however ruled out the Skywatcher and Bintel scopes (thanks mbaddah for the link). I prefer the arsenal of the accessories and cost of the GSO over the Skywatcher and the freight from Bintel to Perth is much greater than the cost of the free telrad
Oh the pressures of decision making