They did the run through first and then the producer came out and got the readers and Terry to re-record various lines etc. You wouldn't know it but Terry forgot to say hello at the beginning so the hello you hear in the recording was one of the last things said. Which is why there is a lot of laughter mixed in with the applause.
My memory isn't great but as far as I can tell they kept in most of Terry's recommendations. I think that is why the moved it to midday to ensure the got the full hour.