I've found out the viewing figures from various sources. With that in mind....
Australian Grand Prix - 2008
Qualifying LIVE - 380,000 (25.66%)
Qualifying RR - 1.7m (16.66%)
Total Quali Audience - 2.08m
Race LIVE - 810,000 (54.43%)
Race RR - 3.75m (23.01%)
Highlights - 305,000 (7.71%)
Total Race Audience - 4.86m
Australian Grand Prix - 2009
Qualifying LIVE - 800,000 (44.6%) [increase of 110%]
Qualifying RR - 2.5m (27.3%) [increase of 47%]
Total Quali Audience - 3.30m [increase of 58%]
Race LIVE - 2.1m (60.5%) [increase of 159%] (peak: 3.4m @ 08:30)
Race RR - 2.8m (30.2%) [decrease of 25%] (peak: 3.1m)
Highlights - 300,000
Total Race Audience - 5.2m [increase of 7%]
Comparison - Qualifying Combined
03.30m - 2009 Australian Grand Prix
02.98m - 2008 Brazilian Grand Prix *primetime*
02.12m - 2008 Canadian Grand Prix *primetime*
02.08m - 2008 Australian Grand Prix
01.96m - 2008 Malaysian Grand Prix
01.96m - 2008 Chinese Grand Prix
01.88m - 2008 British Grand Prix
01.87m - 2008 Singapore Grand Prix
01.84m - 2008 Belgium Grand Prix
01.78m - 2008 Hungarian Grand Prix
01.75m - 2008 Japanese Grand Prix
01.69m - 2008 Monaco Grand Prix
01.65m - 2008 French Grand Prix
01.55m - 2008 Italian Grand Prix
01.49m - 2008 German Grand Prix
01.48m - 2008 Bahrain Grand Prix
01.37m - 2008 Spanish Grand Prix
01.13m - 2008 Turkish Grand Prix
01.05m - 2008 European Grand Prix
Comparison - Race Combined
10.40m - 2008 Brazilian Grand Prix
05.27m - 2008 British Grand Prix
05.20m - 2009 Australian Grand Prix
05.13m - 2008 Chinese Grand Prix
04.94m - 2008 Belgium Grand Prix
04.91m - 2008 Singapore Grand Prix
04.86m - 2008 Australian Grand Prix
04.59m - 2008 Hungarian Grand Prix
04.49m - 2008 Monaco Grand Prix
04.45m - 2008 German Grand Prix
04.30m - 2008 Italian Grand Prix
04.28m - 2008 Canadian Grand Prix
04.03m - 2008 Japanese Grand Prix
03.81m - 2008 Bahrain Grand Prix
03.80m - 2008 Spanish Grand Prix
03.70m - 2008 Malaysian Grand Prix
03.66m - 2008 French Grand Prix
03.43m - 2008 European Grand Prix
03.00m - 2008 Turkish Grand Prix
For European and American races, the live and highlight figures are added to make a combined figure.
For Asian race, the live, re-run and highlight figures are added to make a combined figure. Note also none of the BBC figures include those that have watched on Red Button, iPlayer or the BBC F1 website so that probably equates from a few hundred thousand more.
Good figures for the Beeb... I expected the Race Re-Run to have been a tad higher, but a good start.