Crazy to see this story on the front page of the BBC and now Hacker News too! Ronnie was an awesome guy, and absolutely a part of Rob and Dianne's family, not a "maid" as another comment suggested.
I've never used Hapi, but I followed the process when Walmart wanted to discontinue the project. Unfortunately, even though it's quite an interesting backend framework, I don't see the need to use it with the existence of other solutions.
Very soothing. Now I'm wondering how common "a supermarket trolley on the track earlier on this train's journey" is in Scotland that they needed to pre-record that audio.