Just to add to this post ... I never have felt comfortable about nocturnal man, though. The police searched his home 3 times in the first 24 hours. I believe that FGM proclaimed her thought that it could be him after that, because she was assured that he had been checked out thoroughly.
Also, in an article linked recently it says that they were 'unable' to name him. And I wondered why they were unable to do so. Because he was a sex offender? Or other reasons?
If he was a protected (grrr ...) sex offender, it could be why police searched his home 3 times in the first 24 hours.
Also, when we saw pics of the inside of his home, when it went up for 'urgent sale by owner', there was a stuffed teddy bear sitting on the back of the couch. That raised my eyebrow.