Lawrence "Larry" Nightingale was a movie buff who worked in a video-store with Sally Sparrow.
Sally told him that his sister had gone on a trip when she had in fact been transported to Hull in 1920 by the Weeping Angels. Kathy got married to Ben Wainwright, lived a full life, and died in 1987. Unbeknownst to him, Larry had a niece and two nephews older than he was. They also spoke about the easter-egg, Larry describing it as a "ghost DVD extra" which not even the manufacturers or the publishers know anything about. He deduced that it was half of a conversation and he and "the guys" (the Internet) were trying to figure out the other half. He gave Sally the list of 17 DVDs containing it before she left.
Sally later found out that the easter-egg was meant for her, inserted on all of the DVDs she owns by Billy Shipton, who had been transported back to 1969. She and Larry went to Wester Drumlins where they watched the DVD extra again, Larry writing in their bits of the conversation in short-hand.
They confronted the Weeping Angels, Larry nearly getting sent back by one when he looked behind him. They successfully returned the TARDIS to the Doctor and Martha and trapped the Angels by making them look at each other. Sally and Larry began running the video-store together. One day the following year, Larry found Sally sorting things from their encounter into a folder, wondering if it was getting in the way of "other things". They soon after met the Doctor and Martha in person, and walked back in the store holding hands. (TV: Blink)