A comment and a promise from Josh, a kindly visitor to this blog, reminded us of an old favourite that has been covered here in late 2008. All the material for that entry was gleaned from books, most especially from Brennan's Time Travel: A New Perspective, so we only included data that were available in those sources.
But early today, thanks to insomnia and the full moon that kept me happily awake, I found myself watching TV in the early hours of the morning, when an old programme I had totally forgotten about came on: Ghost Hunters.
As I sat watching it, I suddenly remembered that an episode of that series covered the Wotton Hatch incident, among others. I could not remember the title (the first and so far last time I had watched it was in 1996 or 1997), but it didn't take me long to find it.
It is the episode called Ripples in Time. (And it covers not only the Wotton Hatch incident, but starts with another one of our favourites: C. G. Jung's "time slip".)
The "Mr and Mrs Allan" from our post were really a well-known bookshop owner, Eric Barton, and his wife, Irina. And there is much, much more additional - and more importantly, first hand! - information about the whole incident.
Thanks to the magic of the internet, you can watch it
EDIT: The link seems to have gone dead.
For the time being, you can see the video
EDIT (4. I. 2013): Watch it here... while you can.
If you want to report a perceived dimensional anomaly, please do, but read this first.