Sausage makers Heck Food are facing a nationwide boycott after a PR stunt with Boris Johnson - in which the Tory leadership hopeful was helped by Heck staff to create his own "Boris Banger" sausage in front of a hoarde of assembled photographers - backfired catastrophically, with huge swathes of social media users accusing the firm of political bias and vowing never to buy their products again under the hashtag #BoycottHeck.