[spireitematt]

Even if we win two out of three and avoid defeat in the other then Australia will retain them because they won them in Australia a few years ago.

Think you've got a bit confused there; to win two out of the three remaining Tests and avoid defeat in the third would allow England to win the series 2-1.  The next match is certainly a must-not-lose, but we could conceivably draw it and still win the Ashes with back-to-back victories in the fourth and fifth Tests.

Yeah your right. The chances of that happening though is pretty slim, only reason we managed to get a draw at Lord's though was the weather helped.