
One of the terms used in Chapter 1 was "About as much fun as a shag on a rock" ... which seems to be confusing the Brittish term of Shag (To Fornicate/Copulate) with the Australian expression of 'feeling like a Shag on a rock'.
The Australian expression is one of exhaustion, rather than implied expression of discomfort. The expression comes from the Black Cormorant also called a Shag, which after diving for food stands on a nearby rock drying it's feathers, looking utterly exhausted.
There was also the 'Busy as a one armed Bill Poster in a gale' -- which *might* be Australian, but the only version I've heard locally is 'Busy as a one armed Nailer' ... similar, but pretty rare. Maybe more appropriate to use 'Busy as a blue arsed fly' - which afaik is more common.