Dan's house (seen at the seven minute mark) is number 37, the house next door is number 49. In UK streets the next house would be 39 (with the even numbers on the opposite side of the road).
It was established in Blink (2007) that the Weeping Angels cover their eyes so as not to risk looking at each other, because that would turn them into stone statues. However, this is necessary only in the presence of more than one Angels. If there is only one Angel present, as is the case here, there is no need for it to cover its eyes.