By Elliot Gulliver-Needham One of the world’s oldest commodity traders, backed by Primark owner Associated British Foods (ABF), is plotting a £300m float on the London Stock Exchange. Czarnikow, which ships a variety of foodstuffs, has begun meeting with groups of institutional investors with a goal of floating in the next few months, Sky News reported. The group is part owned by both ABF and Australian private equity giant Macquarie, with each holding a 42.5 per cent stake in the firm. The remaining 15 per cent of shareholders is Czarnikow’s employee benefits trust. Czarnikow was founded in 1…