Why are more people claiming disability benefits?

More working age people are claiming disability benefits. What's driving the trend?Is it true that the UK imprisons more people for their social media posts than Russia does?One of the country’s most important data sources has been falling apart. We find out why. Tim Harford investigates some of the numbers in the news.Presenter: Tim Harford Reporter: Lizzy McNeill Producer: Nathan Gower Series producers: Charlotte McDonald and Tom Colls Production co-ordinator: Brenda Brown Sound mix: James Beard Editor: Richard Vadon