ITV need to use there big shows (bgt, xf, iac) to lead in to new programmes more often. This is one area that ITV needs to take lessons from the american networks. Of course its not going to work every time, but the issue ITV seem to have is getting people to sample programmes, and this is the best possible way.
Choose a couple of new dramas, that ITV have confidence in, and have the option to be returnable dramas (ensemble dramas in the vein of Londons Burning, Peak Practice), no more of these one off dramas or dramas that have very little returnability in there story. Premier the first episode after the first sunday episode of x-Factor on sunday at 9pm, run the second episode on Monday after Cory at 9pm, work with the producers to do a big cliff hanger episode, then run the remaining episodes at thursday at 9pm, after a special Cory or Emmerdale episode. Week 2 premier a drama again on sunday at 9pm, have the second episode at monday at 9pm, do the double up again for the next week, then put the remain episode episodes on monday at 9pm with the Cory lead in. They could label this premier Sunday, and finish it with Downton Abbey taking over the sunday 9pm slot.
Rather than giving Cory the week long bgt slot, commission a older skewing comedy (in the vein of Benidorm) or a family sit com for at least 8 episodes, and run 5 of the episodes after bgt, then for the remaining episodes see how they work in the thursday 8.30pm slot with a emmerdale lead in.
I know the advertising rules actually penalise ITV One for this approach, and traditionally ITV more and more have moved there big dramas to late october starts, rather than the more traditional late september start, due to trying to get the most bang for their bucks, and earlier starts may leave the chest a bit bare later in the season, but they need take this risk to get a couple more returnable programmes. Even if they can get just one more mid performing returnable drama, they would be a stronger position.