It was 20 years ago, but I think he waited until the following Saturday morning groceries shop at Tesco's Uckfield, where he approached her and said "Hi Amanda (or whoever), I hope you don't mind me saying, but I think you're very pretty. ........ ". He must've then revealed that he'd tracked...
A former colleague (who considered himself a lothario) wrote to DVLA to get the name and address of the female owner of a car, who he fancied from seeing her in Tesco’s car park Uckfield.
This was in the 90’s, pre the modern Data Protection rules.
He did end up dating her, before she went back...