Welcome to Andrew's thread, there is a decent summary of the case at this 2018 link..rbbmThank you for this information. As you say, maybe he intended returning on a different day. Did he know anybody in London? Apologies if all this information has already been stated, I'll have to read through the thread from the start.
https://www.vice.com/en/article/vbjwb3/the-strange-disappearance-of-andrew-
gosden
''Andrew Gosden was born on the 10th of July, 1993. He lived in Balby, Doncaster, a suburb of the South Yorkshire town that is largely unremarkable, save for the fact the classic BBC sitcom Open All Hours was once filmed there. Andrew was smart. He was a member of the Young Gifted and Talented programme, a scheme designed to enhance the educational development of the top 5 percent of schoolchildren. Teachers at McAuley Catholic High School believed he was a shoe-in for Cambridge."Andrew was too clever by half," remembers Kevin. "He tended to say little about school, but we remember him coming back from summer school for gifted and talented kids, and he was absolutely enthused about what he had been doing. To be honest, I think Andrew saw school as something you sort of had to do just in order to have choices open to you for adult life."
''The police took the computers from Andrew's school and from Doncaster Library – they found nothing. Sony confirmed he didn't have an online account on his PSP. He had no social media; "he just didn’t seem very social", Charlotte told the Thin Air podcast last year.
Though his parents are religious, Andrew stopped going to church 18 months before his appearance. He was a Cub Scout, though stopped attending a few months prior to the 14th of September. That summer, his parents had suggested he stay with his grandmother in London, but he didn’t want to go.''