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Welcome to Unexplained Extra, with me Richard McLean Smith.

Where for the weeks in between episodes we look at stories and ideas that for one reason or other didn't make it into the previous show.

In our last episode, Folly Adure, we followed the extraordinary story of 40-year-old twins Sabina and Ursula Ericsson.

In 2008, the pair embarked on a bizarre and chaotic journey from Ireland, bound for London, England, which resulted in a serious injury for Ursula and the murder of a seemingly innocent man, Glenn Hollinshead, which Sabina was later convicted of.

Psychiatrists argued that Sabina had suffered from a very rare form of momentary insanity known as Folly Adure, a madness of two.

The condition they believed had been brought on due to Sabina's apparent intense connection to Ursula, who was thought to have been suffering from a fevered state of paranoia and delusion at the time, which was effectively contracted by Sabina.

However, since cases such as these are extremely rare, with some medical professionals even questioning their existence, and would neither sister going on record to explain exactly what occurred, some have questioned the official narrative of this story, or at least what little there is of it.

One of the more contentious theories about what actually happened is the suggestion that Sabina and Ursula were acting under some kind of caress, or had been instructed to complete a task of some kind, with links to a large drug operation.

It has also been speculated that the pair were already under police observation when they were initially spotted walking along the motorway.

One argument claims that cut footage from a 2008 BBC documentary detailing the unusual events reveals that the two women were initially arrested under section 136 of the Mental Health Act.

Had this been the case, Sabina would not ordinarily have been released only a few days later, and as such would not have gone on to kill Glenn Hollinshead.

The inference being that perhaps an order had come from higher up to let Sabina go regardless of her health because the police wanted to secretly track the rest of her journey to find out what she was up to.

However, this supposedly cut footage was included in an earlier TV show screened by the BBC, which suggests there was no such cover-up.

Furthermore, the clip in question doesn't actually show that they were arrested under section 136, but rather that there was the possibility that they might be.

I have to admit I was a little unsure about whether I should tell this story on unexplained, partly because it occurred so recently,

but also because it feels in some ways exploitative in ways that other unexplained stories haven't.

Certainly, if you read up anything about the events online, it isn't long before you come across all sorts of prurient theories about why things unfolded the way they did,

...