The whole towers model is nuts IMO! It just paves the way for finger-pointing and shunting support tickets around to avoid anybody actually owning the problem.
I seriously doubt that much will really change: Whichever of the usual suspects wins the new contracts will likely just back-off chunks of the work to the original providers - either that or they'll do nothing for a couple of years until it all goes titsup and they lose the contract.
The shameful waste of pubic money on vastly overpriced purveyors of poor quality is saddening but apparently outsourcing saves lots of money.
AC just because.