England's selection and batting order

I'm a little confused by some of the discussion about England's batting order - I thought the top 7 picked themselves in whatever order....Strauss, Pietersen, Trott, Bell, Bopara, Prior, Collingwood. But several observers seem to be missing Bopara from their potential team - Michael Vaughan seems to be expecting Bopara to miss out. And others don't seem to think Collingwood gets in.

When Bopara came in as a better 6th bowler than Trott, I thought it would mean that doubts about the selection of the top 7 would be banished, but apparently not. I can't quite work it out - the home sides all use all-rounders to fill the 5th bowling slot and many use up to 8 bowlers in a match. England can do the same using Pietersen, Trott and Bopara as necessary.

I have faith that Andy Flower will get this right, but we'll have to see!