Investigators sent the unique serial number of Gosden’s PSP to Sony HQ who checked and found that there was no record of an account being set up or communication established on the device. The Sony PSP 1000 had a DNAS authentication system allowing Sony to see when a PSP had connected to the internet. The only PC in the house was his sister's laptop, which had only been in her possession for eight weeks. Gosden's sister has stated that he did not seem interested in social media or connecting with other people through the Internet as he "just didn't seem social". A year after Gosden's disappearance, the head teacher at McAuley Catholic High School, Mary Lawrence, travelled to London with staff and pupils and distributed 15,000 leaflets. After the initial CCTV trail went cold, the investigation moved on to trying to establish why Gosden had decided to go to London. An early theory put forward by the family was that Gosden had decided to take in some of the sights. Gosden was known to have enjoyed London, and would visit the capital with his family to see his grandparents, aunts, uncles, and family friends who lived there. He also enjoyed visiting London's museums and exhibitions. According to Gosden's father, Gosden also had a good knowledge of how the public transport system worked, knew the layout, and was confident in navigating his way around the city. Travelling on buses was free for children at the time of Gosden’s disappearance. One event identified by Kevin Gosden as a possible reason for his son to have travelled to London was the 2007 YouTube Gathering. However, there is no evidence that Gosden attended this event or had any interest in YouTube. The family also looked into music concerts that Gosden might have gone to London to attend. The night of his disappearance, Thirty Seconds to Mars played the Brixton Academy and SikTh played a rescheduled farewell show at the Carling Academy. SikTh have played gigs with Slipknot and the venue is within walking distance from King's Cross. The SikTh gig was originally scheduled for 4 pm on 7 July and was to be the last show with the original vocalist, making it a unique event. Mick Neville, retired head of the Metropolitan Police's Central Images Unit, believed the SikTh theory to be plausible. He appealed for anyone with photos or videos taken at the gig to come forward so that "super recognisers" could scan the images. Neville went on to state: "There is a canal nearby (Regents Canal).