Segmental reporting
In addition to presenting the consolidated financial results and financial position in the financial statements, we provide a breakdown of those results and balances into our business segments. The presentation of segment information is based on management responsibilities that existed at 31 March 2009 and the external and regulatory environments in which we operate. Our business segments are Transmission UK, Transmission US, Gas Distribution UK, Gas Distribution US and Electricity Distribution & Generation US, with our non-regulated businesses, other operations and corporate activities, including business development, being aggregated within other activities. Our geographical segments reflect our principal activities in the UK and the US.
Discontinued operations comprise the Ravenswood generation station in New York City, sold on 26 August 2008, KeySpan Communications, sold on 25 July 2008 and our KeySpan engineering companies, one of which was sold on 11 July 2008. Subsequent to the year end two further engineering companies were sold.
Discontinued results in prior years also include the results of our wireless infrastructure operations in the UK and the US, and the Basslink electricity interconnector in Australia which were sold on 3 April, 15 August and 31 August 2007 respectively.