The Big Issue celebrates 25 years on the UK’s streets this week, with a exhibition in London, a star-studded film – and, of course, a bumper edition of the magazine. Watch messages from Julie Walters, Michael Palin, Mark Hamill, Mayor of London Sadiq Khan, Chvrches singer Lauren Mayberry and more.

Check out the new trailer for the Street Cat Bob film – which tells the story of Big Issue vendor James Bowen and his high-fiving ginger cat.

Rising British actor Luke Treadaway is set to play former Big Issue seller James Bowen, whose books about how a stray ginger cat called Bob helped him out of homelessness have sold more than 4 million copies worldwide.