Punch Taverns, the leased and managed pub group, has appointed Citigroup as its joint corporate brokers with immediate effect. The move ends a longstanding relationship with Merrill Lynch and comes as new chief executive Ian Dyson conducts a review of the business. It said Goldman Sachs International would continue as financial adviser and joint corporate broker to the company. The company is also understood to have given notice to its PR team at Smithfield, after just 18 months in the role.