76 Consolidated  Notes to the  Financial  Statements Note 3 – Segment information (continued) Information regarding the consolidated entity’s reportable segments is presented below. Retail  Merchant  Upstream  Energy Energy  Energy  Gas  Investments  Other  Total $m $m $m $m $m $m 2011 Total segment revenue  6,087.5 4,183.1 90.0 – – 10,360.6 Inter-segment revenue  (30.5) (3,216.8) (40.8) – – (3,288.1) External revenue 6,057.0 966.3 49.2 – – 7,072.5 Earnings before interest, tax, depreciation and  amortisation (EBITDA) 416.8 447.3 35.1 40.5 (135.2) 804.5 Depreciation and amortisation  (43.8) (69.1) (21.5) – (13.6) (148.0) Operating EBIT 373.0 378.2 13.6 40.5 (148.8) 656.5 Net fi nancing costs (37.4) Underlying profit before income tax  619.1 Income tax expense (188.0) Underlying profi t 431.1 Segment assets 3,540.6 3,385.5 1,278.9 351.0 90.0 8,646.0 Segment liabilities 284.0 705.0 83.9 – 105.4 1,178.3 Other segment information Share of profits of associates and jointly controlled entities  – – 0.5 33.1 – 33.6 Investments in associates and jointly controlled entities  – – 4.4 236.3 – 240.7 Additions to non-current assets  81.1 317.3 277.5 – 27.9 703.8 Impairment losses  – – (0.2) – – (0.2) Other non-cash expenses  (62.6) – – – (2.0) (64.6) Gain in fair value of financial instruments  – 213.0 – 5.8 – 218.8 Significant expense items  (4.6) (5.7) – – (34.0) (44.3) Total segment revenue  5,580.2  4,081.8  77.5  6.2  –  9,745.7 Inter-segment revenue  (35.5)  (3,050.1)  (49.4)  –  –  (3,135.0) External revenue 5,544.7 1,031.7 28.1 6.2 – 6,610.7 Earnings before interest, tax, depreciation and  amortisation (EBITDA) 360.2 449.8 26.6 81.7 (128.7) 789.6 Depreciation and amortisation  (41.5)  (63.7)  (21.1)  –  (11.2)  (137.5) Operating EBIT 318.7 386.1 5.5 81.7 (139.9) 652.1 Net fi nancing costs (47.5) Underlying profit before income tax  604.6 Income tax expense (175.7) Underlying profi t 428.9 Segment assets 3,472.8 3,210.7 1,008.3 300.0 76.1 8,067.9 Segment liabilities 322.9 682.5 43.1 0.6 108.9 1,158.0 Other segment information Share of profits of associates and jointly controlled entities  –  –  0.3  70.4  –  70.7 Investments in associates and jointly controlled entities  0.9  –  3.9  196.0  –  200.8 Additions to non-current assets  31.8  215.1  123.1  –  29.5  399.5 Impairment losses  –  (0.6)  (15.9)  –  (7.8)  (24.3) Other non-cash expenses  (59.6)  (9.1)  (2.0)  –  (10.9)  (81.6) (Loss)/gain in fair value of financial instruments  –  (182.4)  –  5.0  –  (177.4) Significant expense items  (12.4)  –  (14.0)  –  (23.2)  (49.6) 2010