Update on the Pasteurella threat:
My avian vet recently told me that the incidence of Pasteurella Multocida in cat saliva has been greatly reduced, and tests revealed that all the feral cats taken to this veterinary clinic in Portugal to date were free of the bacteria.
This is great news, but of course there will be exceptions, and it's best to play safe! For my part, I immediately give a course of Synulox to any predator-caught pigeon I rescue.