O2 (UK) they can do it too" in reference to Vodafone and EE, O2's biggest competitors and the UK's top three mobile-telecoms companies. 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
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