E.ON UK PLC, Coventry, England, hired Hewitt Associates as investment consultant for its newly combined £4 billion ($7.34 billion) defined benefit scheme and will conduct an investment review later this year, according to a company spokesman. The firm's four pension plans were recently merged after E.ON acquired several British-based electricity companies. "The investment strategy as a whole needs to be coherent and coordinated as it is now one group and one group of trustees," said Beverley Morgan, investment consultant at Hewitt. The four pension plans have a total of 27 money managers. The combined plan should have fewer managers after the review, said Ms. Morgan, but she would not be more specific..