John Menzies PLC hired Aon Consulting to provide actuarial and investing advice for its £165 million ($267 million) pension fund. Aon replaces William M. Mercer, which was the funds consultant for about 10 years. Aon is reviewing the Edinburgh, Scotland-based funds investments, which may result in some minor adjustments, said Cathy Fleming, deputy pensions manager. The "mini-assessment is due in late June, Ms. Fleming said. A full-scale review will not occur until 2001.