Reading the comments about McGrath and Hazlewood led me to realise that a lot of people are slightly misunderstanding this issue. It is not that England need three or four guys who bowl constantly above 90mph, its that they need guys who are built to bowl in Australian conditions. McGrath was built for it - he was tall, had an action that maximised his height, and bowled high 80s. Much like Hazlewood actually.
When England have won in Australia in my lifetime, they have either played shockingly bad teams, or, as in 2011, have taken a lot of bowlers with some or all of these attributes (Tremlett and Finn were tall, Bresnan hit a groove in the high 80s etc).
This time, we have a gifted swing bowler, in Jimmy. Then we have Overton, who is good but not ready, Woakes, who is unsuitable and - worryingly - Broad, who ought to be good in the conditions but is not