[newsjunkie]

Didn't they have NBC News as a partner, especially during their ITV News Channel era.

Yes, was NBC until their owner took over Sky and so (after quite a considerable delay) that relationship ended (bar one last remaining link - ITN's Washington operation is still based in NBC's studios there).

They are now closely linked with CNN (though they have always had an ongoing relationship).
They are also 'partnered' with ABC (though this seems to be more adhoc) and they can access CBS material via EBU.

So basically - they are everyone's partner!