O2 (UK) O2 (UK) Telefónica UK Limited (trading as O2 – stylised as O) is a telecommunications services provider in the United Kingdom, owned by the Spanish multinational Telefónica, and is headquartered in Slough. With 25 million subscribers (as of December 2017), O2 is the second-largest mobile network operator in the United Kingdom after EE, with Vodafone in third place. O2 was formed in 1985 as Cellnet, a 60:40 joint venture between BT Group and Securicor. In 1999, BT Group acquired Securicor's share of Cellnet and the company was later rebranded as BT Cellnet. In June 2000, BT Cellnet launched the world's
Hayward Medical Communications Medicines Strategy Group. Hayward Medical Communications Hayward Medical Communications is a division of Hayward Group Limited. It is a UK-based medical communications agency and publisher, with offices in London and Newmarket. Founded in 1991, Hayward Medical Communications has a portfolio of journals targeted at healthcare professionals and patients. The company also publishes multimedia products and services for the pharmaceutical industry, as well as for government agencies, charities and non-governmental organisations. Its services include consultancy, programme planning, professional training and health technology assessment submissions to the NHS agencies: the National Institute for Health and Clinical Excellence, the Scottish Medicines Consortium, and