SENIOR ENGINEERING MAKES 12.5 MLN DLR US PURCHASE <Senior Engineering Group Plc> said it reached agreement with <Cronus Industries Inc> to acquire the whole share capital of <South Western Engineering Co> for 12.5 mln dlrs cash. This sum is being financed by a term loan. South Western is one of the U.S.'s leading manufacturers of heat transfer equipment, with a turnover of 54.86 mln dlrs and pre-tax profits of 1.72 mln in 1986. Completion of the deal is conditional on approval under U.S. Hart-Scott-Rodino regulations which is expected within 30 days. Some 350,000 dlrs is payable immediately, 12 mln dlrs payable on completion with the balance due by June 30, 1987.