Some things just don’t pass the gut test. Your head tells you they’re right, all the facts point in their favour, but you can’t suppress a dyspeptic rumbling. The jailing of Catalan separatist leaders should give us all political indigestion. On Monday, Spain’s Supreme Court sentenced 12 activists and key figures from the autonomous government and parliament of Catalonia, all of whom helped organise an illegal referendum in October 2017 to secure independence for the Spanish region.