Update:
I visited a (reasonably) local telescope shop with a view to looking at some 10" dobs and saw a 12" collapsible. It was so big it scared me - so I bought one.
The forecast is for clouds and showers for the next few days, so I'll have plenty of time to learn to collimate it with a cheshire (and to start building a trolley so I can move it out of the garage.)
Also picked up a copy of the "Atlas of the Southern Night Sky" (4th Ed.)