I have a season pass for 20/20 and unfortunately, most of the eps have been crap for years and I delete most of them. It caught this one-off ep aired on a Tuesday (vs. the usual Friday).
You can watch the full ep below:
I started watching the beginning to see if I should bother watching the rest, esp. since I'd never been that interested in the British monarchy. Surprisingly, I'm already 50 minutes into it...