O2 Plc.

Peter Erskine was appointed to the Board in 2001 as Chief Executive Officer. He joined the Company from BT where, since March 1993, he held a number of senior positions including Director of BT Mobile, President and Chief Executive of Concert, and, from 1998, Managing Director of BT Cellnet. Prior to joining BT he was European Vice President of Sales and Customer Service for Mars and Senior Vice President Sales and Marketing for UNITEL. Mr Erskine is also a member of the Advisory Board of the University of Reading Business School. Following Telefonica's acquisition of O2, Mr. Erskine became Chairman and Chief Executive of O2 and also joined the Board of Telefonica, S.A. as an Executive Director. Mr. Erskine is also Chairman of the supervisory board of Telefonica O2 Czech Republic a.s.

Antonio Viana-Baptista serves as Chairman and Chief Executive Officer since August 2002. He is an economist who graduated from the Catholic University of Lisbon in 1980. He has a post graduate in European Economy (1981), and an MBA, obtained with a distinction mention, from INSEAD (Fontainebleu). He is member of the board of directors, the Delegate Committee and the Executive Committee of Telefonica S.A. He is also Chairman of Telefonica Moviles Espana, S. A. and member of the board of directors of Telefonica Internacional, S.A., Portugal Telecom SGPS, Brasilcel N. V. , CTC Chile, Telefonica de Argentina, S. A. and Telecomunicacoes de Sao Paulo S. A. Until July 2002, he served as President of Telefonica Internacional and Executive President of Telefonica Latinoamerica. Before that he also served from 1991 until 1996, as Executive Director of BPI (Banco Portugues de Investimento). From 1985 until 1991 Mr. Viana-Baptista was Principal Partner of McKinsey & Co. in Madrid and Lisbon. He was appointed to the O2 Board on 23 January 2006 after the Telefonica offer for O2 went unconditional.