We have strange ways of marking the festive season. In Cornwall, wassailers bang pots and bless the trees with cider. In Stonehaven, the streets are filled with fireballs. And in another peculiar folk tradition, Radio 4 hands the reins of the Today programme to “guest editors”. Between Christmas and New Year’s Day, those trusted with shaping the news agenda included ex-Top Gear presenter James May and pop star Ellie Goulding.