> "Will the ITC merger (if it is such) actually save any money I wonder?"
Probably. If each is running their own datacentre then there are significant economies of scale in the hotel services alone. There are economies of scale in having a single entity for network, storage and backup administration. And there may be ways of pooling software licences, to eliminate potential over-licensing.
Anyway, it's often not a case of consolidating stuff that's running happily, rather you'd change over as applications came to the end of their lives, and could be replaced by one instance of (say) custody records rather than five.