Analysis of information sources in references of the Wikipedia article "Batting average (cricket)" in English language version.
The numerical facts are that England have scored 1260 runs off the bat to Australia's 1245... both sides have lost 38 wickets. Thus, England's batting line-up has a collective average of 33.1, Australia's 32.7.
Perhaps the most damning statistic was that the difference between Pakistan's collective batting average of 80.15 and Australia's of 25.65 was the all-time biggest gap in an Australian series defeat.
However, only 54 of those runs came in Australian Test whites, with Law making an unbeaten half-century in his only Test innings, meaning he finished his career without a Test average.