We know you're a whizz with the Bic, that you wield the clippers like a champ and that you've carefully studied our video guides to treating your facial hair with the respect it deserves. But sometimes there's nothing like the swish of the cut-throat razor – in the hands of trained expert – for getting that beard looking its absolute sharpest. We sent ASOS Stylist James Welsh to Ruffians in London to find out exactly what the deal is with the old-school professional trim.