Rosie Duffield’s re-join remarks will haunt the Labour party

Every party keeps on file a list of rash things politicians in other parties have said that can be used against them at a later date.

Way back when I was directing Ukip’s 2014 European parliamentary campaign, I built up a ‘helpful contributions’ folder containing print-outs of gaffes and embarrassing admissions made by pro-EU MPs and MEPs.