d guru Sir [Martin Sorrell](//www.standard.co.uk/topic/martin-sorrell) has warned that deteriorating [US](//www.standard.co.uk/topic/us) – [China](//www.standard.co.uk/topic/china) relations are causing significant issues for multinational businesses like his. The [S4 Capital](//www.standard.co.uk/topic/s4-capital) boss told the Standard that the brewing [cold war](//www.standard.co.uk/topic/cold-war) between the West and China was the “biggest commercial issue” facing [business](//www.standard.co.uk/topic/business)…