The demerger of mmO2, the group's former mobile phone business, was successfully completed on 19 November 2001 after being announced in May 2001. The demerger followed meetings held in October 2001, at which BT shareholders voted in favour of the scheme of arrangement and demerger of mmO2 to create two new listed companies and also voted in favour of the BT Group reduction of capital. The scheme of arrangement and reduction of capital were subsequently approved by the High Court. The demerger became effective on 19 November 2001 and the reduction of capital on 21 November 2001. Dealings in BT Group and mmO2 shares commenced on 19 November 2001. BT shareholders on record on 16 November 2001, received one BT Group plc share and one mmO2 plc share for each existing British Telecommunications plc share held. Based on the first day's dealings on the London Stock Exchange, BT Group represented approximately 78% of the equity value of the former BT group and mmO2 represented approximately 22%.
On the demerger, net assets of £19,490 million attributable to mmO2 were distributed to shareholders in the form of a demerger distribution. mmO2 assumed approximately £500 million of debt, with the bulk of the outstanding debt remaining with the continuing BT Group. The reduction of capital had the effect of increasing distributable reserves in BT Group plc by £9,537 million. As a consequence, the group balance sheet has changed significantly and is discussed later in this review.