Re: Creepy
"When the whole postcode delineates one city street and the satnav takes me to the precise house. And when this precision extends to knowing which side of the road we can rule out simple coincidence."
Unless the street is shorter than average, it's likely to have more than one postcode covering it. My street has one postcode for the northern part, another for the middle (covering just two houses!), and a third for the southern part. If it had house entrances on the odd side as well as the even side, it would probably have another two or three posttcodes to cover those.