Pfizer plans to close two of its three manufacturing plants in the UK during the next four years, which may affect as many as 370 jobs. Pfizer will retain a manufacturing site in south London.   The Park Royal site in London, which Pfizer gained from the Hospira acquisition in September, is set to close by May 2017, impacting 100 employees. The site fills vials, which are then sold to hospitals. Also, Pfizer’s global cold chain packaging and distribution site in Havant, which employs 270...