Disappearance of Andrew Gosden
On 14 September 2007, Andrew Paul Gosden, a 14-year-old schoolboy from Doncaster, South Yorkshire, disappeared after travelling alone to Central London. That morning, he left home as if heading to school, withdrew £200 from his bank account, and returned home briefly to change his clothes before leaving again without informing his family.
Source: Wikipedia — Disappearance of Andrew Gosden (CC BY-SA 4.0)