[1] Pfizer UK has its business headquarters in Tadworth, Surrey, major offices in Maidenhead, Berkshire, research and development facilities in Cambridge, Cambridgeshire and Sandwich, Kent, and a manufacturing and distribution site in Havant, Hampshire.

[2] To satisfy regulations then in place in the United Kingdom on the importation of medicines, Pfizer established a compounding operation in Folkestone, Kent, in the Autumn of 1952.

[5] Feldene (piroxicam), a non-steroidal anti-inflammatory drug developed jointly by the Sandwich site and Pfizer's R&D facility in Groton, United States, was launched in 1980.

[6] In April 2001, Pfizer UK received the Queen's Award for Enterprise for the discovery and development of the erectile dysfunction drug Viagra (sildenafil).

[9] Dr Ken Richardson was inducted into the US National Inventors Hall of Fame in May 2008 for his role in the discovery of Diflucan whilst working at Pfizer UK.

[16] In April 2011, Pfizer established Neusentis in Cambridge, intended to operate as a biotech-like unit combining research in pain, sensory disorders, and regenerative medicine.

[20] In August 2011, it was announced that the Pfizer site at Sandwich would become an enterprise zone with discounted business rates, easier planning rules, and access to superfast broadband.

This move follows the company's lowered annual revenue projections, affected by diminishing demand for its COVID-19 vaccine and treatment, which led to Pfizer's first quarterly loss since 2019.