Designated drivers reveal annoying habits of festively fuddled passengers

Sober motorists are likely to encounter at least one entry on this list of irksome habits, as booze-free designated drivers selflessly ferry around tipsy friends and family this Christmas.

The survey, which was conducted by music streaming service Deezer, revealed that 'drunken passengers singing out of tune' is the biggest woe for over a fifth of designated drivers this festive season.