Exhibit 12.1 CALCULATION OF EARNINGS TO FIXED CHARGES RATIO SUCCESSOR COMPANY Excluding the results of the generation business YEAR ENDED MARCH 31 1999 1998 (POUND) $ (POUND) (Amounts in millions) Earnings Pretax income from continuing operations 62 100 5 Adjustments to include distributed income of less than 50% owned persons - - - Add: Amortization charge on capitalized interest - - - Less: Interest capitalized in the period - - - Total earnings before fixed charges 62 100 5 Fixed charges Interest expense 126 203 117 Interest capitalized - - - Total fixed charges 126 203 117 Total earnings and fixed charges 188 303 122 Ratio of earnings/fixed charges 1.4 1.4 1.0 Including the results of the generation business YEAR ENDED MARCH 31 1999 1998 (POUND) $ (POUND) (Amounts in millions) Earnings Pretax income from operations 68 110 16 Adjustments to include distributed income of less than 50% owned persons - - - Add: Amortization charge on capitalized interest - - 1 Less: Interest capitalized in the period - - - Total earnings before fixed charges 68 110 17 Fixed charges Interest expense 129 208 121 Interest capitalized - - - Total fixed charges 129 208 121 Total earnings and fixed charges 197 318 138 Ratio of earnings/fixed charges 1.5 1.5 1.1