The POD is that the 1990 Australian federal election which was narrowly won by Labor, was instead won comfortably by the Liberal and National parties lead by Andrew Peacock who becomes Prime Minister. The Deputy Prime Minister would be National Party leader Charles Blunt, who in this TL retains his seat of Richmond (in OTL he was defeated in Richmond in the 1990 federal election).
For this to happen the Liberals would have needed to adopt negative campaign against the governing Labor party, which was on the nose with the voters around that time.
While the incoming Coalition government would have a majority of 20 seats out of 148 in the Lower House. They would not have a majority in the Senate where they only had 34 out of 76 seats, this force the Coalition to negotiate with either the Labor Party (holding 33 out of 76 seats) or the Australian Democrats lead by Janine Haines holding 8 out of 76 seats.
Thoughts anyone