Credit Suisse’s internal review into Greensill Capital’s collapse is pointing the finger at Marsh & McLennan, the world’s largest insurance broker, according to people familiar with the matter. Financial institutions from Sydney and Tokyo to Zurich and London are preparing for a lengthy legal battle over who will absorb losses linked to Greensill, the supply chain finance group that filed for administration this month. Greensill lent money to corporate customers including Sanjeev Gupta’s GFG Alliance and securitised the debt into notes that were put into funds at Credit Suisse and sold to investors.