Dan Walker has shown fans a "strange stain" in the BBC Breakfast studio, just days after announcing that he will be leaving the morning programme within the next few weeks.
The presenter, 45, has been on the BBC for 13 years but is set to move over to Channel 5 later this month, with him due to become a news anchor for the rival broadcaster.
Ahead of his departure from the BBC, he has taken the opportunity to document a mysterious stain that can be found on the floor of the studio located in Salford.
