The current rankings for ODI teams have England at number one closely followed by India with a significant gap to New Zealand then a similar gap to South Africa who are ranked fourth.
The gap to the fifth team which is Pakistan is enormous & they are only marginally ahead of Australia who are currently sitting in a lowly sixth position.
Since Trevor Bayliss ( an Ozzie, by the way ) took over the coaching of the England side he introduced a new approach to ODI cricket & that was to treat it as a 50 over T20 game, go out hard as they do in the T20's, but no matter the situation, no matter the score or how many wickets may have been lost, maintain that " T20 " attitude all the way & keep going hard all through the innings.
Initially, this strategy cost the team a lot of potential victories, but they persisted with it & in recent years they have reaped the benefits to the point where they are now quite appropriatlety, ranked number one in the world.
So the " perfect storm " is set, we have a crippled Australian team ( 6 of our best players are missing , that is more than half the team ) who are touring England & it is their first international since the shameful debacle in South Africa.
Not a problem, the depth in Australian cricket is so strong that we can send a side of our " second stringers " & still expect to give England a decent run for their money.
The England team simply continued to play in their normal fashion & with virtually no " class & experienced players " in the opposition to counteract their aggression, they were able to totally humiliate this " Australian " side while posting their world record score which i am sure will stand for a very a long time.
So Pen, you should indeed be " chuffed " as i join you in applauding the magnificent effort by the Poms to post such an incredible score.