Cancer fundraising hero, John Burkhill, known as the Man with the Pram, was at a book signing event at the Moor Market today. John who is 77 years old, has raised £350,000 for Macmillan Cancer Support and has completed at least 965 races including running the London Marathon 16 times. Sheffield Live! reporter Shamaan Freeman-Powell spoke to one of his biggest fans, Lord Mayor Denise Fox.