I have now come across a YouTube video of the same story and actually featuring the people involved i.e. the two Laura Buxtons and their families. Stories like this are always knocked and the skeptics have a field day - even though they are true. One wrote: "... this solitary, lofty balloon would set in motion a chain of events so strange, it's even difficult for those involved to believe. Of course it's strange and difficult to believe ... because it's complete bullsh*t."
There are those who refuse to accept such things, but that's fine. Anyway, here's the video (less than 3 minutes long), plus please read my original posts if you haven't done so.