Prince William met up with a close friend after he returned to royal duties, just one week after his reunion with his estranged brother, Prince Harry. The 42-year-old’s first post-summer engagement saw him attend a homeless exhibition at the Saatchi Gallery, in Chelsea London. He visited the gallery for the Homelessness: Reframed exhibition which looks to bring to life the issues surrounding homelessness, and whilst there, bumped into a close pal. The future King and Dave Martin, a Big Issue seller, first became acquainted with one another when William quietly joined Martin to help sell copies…