Ok, this is what I think will happen on the night: Catt will be handed the 10 jersey but he will play at 12 when England are in attack and he will do most of the kicking in general play; Farrell will play at 10 in defence and counter-attack or they will generally switch around a bit to keep the Japies in two minds.
It looks like there is a general trend anyway toward the NZ system of of first and second five-eighth (which Australia have also adopted since emergence of Matt Giteau).
Or Option two is that the Poms will simply lose the plot and run around like a bunch of Headless Chickens... which should still be enough to send the Aussies packing if the two sides meet in the QF!
