interesting...
I don't know this, but I'd hazard at a guess that he'd need his car to be at the house... so did drive away from the house so his car could be seen at home.
Of course, he may have walked it to the house anyway, but still suspect he'd want to be seen arriving home, and leaving the car parked outside.
Although nobody could substantiate his alibi, I doubt many single men living in a village could substantiate their whereabouts in the early hours of the morning. Probably a few hundred men in the area without a corroborated alibi. All in bed, asleep, alone.