A 20-year observational cohort of a 5 million patient population-Tonsillectomy rates in the context of two national policy changes.

Aim: (a) To report national trends for tonsillectomy, tonsillitis, peritonsillar abscess and deep neck space infection in secondary care. (b) To report national trends in sore throat consultations in primary care. (c) To report national trends in antibiotic prescribing in both primary and secondary care between 2011 and 2015.