Ignoring the fact England won't be 150-2, that's a narrow basis for picking a Test #4. It's not going to make you a good Test side - it won't win you matches and series' v the better sides.Only thing with Roy, is that if hes being picked, should he not get a fair crack of the whip in his best FC position......his technique looks flawed, but if he was able to come in at say 150/2, he has the potential to take the game away from a side in an hour or so.
I hope England pick him for the tour to NZ. He's a hopeless Test player. I completely back Boult to make mince meat out of him.