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They're definitely showing it. I saw the start of the coverage on NBC News Now at 10am UK time, and it's on right now.

I wonder if it was blocked here then?

It was still watchable on the NBC News website and anywhere that takes the feed from there, but the NBC News Now YouTube stream didn't start in the UK until 3pm when their coverage finished. 

It was the same for CBS - no YouTube stream in the UK, but still easily watchable here via the web feed. 

I didn't check whether ABC's YouTube stream was watchable in the UK yesterday, but all their coverage is there today. The actual network special starts 2 hours 58 minutes in. 

www.youtube.com 

ABC seemed to go to a bit more effort than the other US networks. I think they were the only ones to build a proper studio, which looked pretty good. 

Anyway, the NBC/CBS situation points to some kind of rights issue - although I've never known it to be the case for royal ceremonies in the past. Does anyone know more?