A comprehensive health database with APIs
Assortment of APIs and other resources, mainly clinical knowledge
NHS Choices API application
Infectious diseases -- CDC
Infectious diseases -- WHO
Infectious diseases -- HPA
Infectious diseases -- MDTravel
Infectious diseases -- Health Map
APIs for SNOFyre, a demonstrator tool for use with SNOMED CT clinical records for aggregation and analysis, giving a range of functions such as browsing the terminology
SNOB, a server for the 300,000 clinical terms found in SNOMED CT
BioPortal, a quick way to support autocomplete on a problem list
ALISS (Access to Local Information to Support Self-management -- Scottish info) -- community assets of all sorts to help people live well with a long-term condition.
Commissioning data packs
National Dementia and Antipsychotic Prescribing Audit info at GP level -- restricted to GPs and selected others
Nationally supported clinical audits
CPRD/GRPD/GOLD -- patient-level GP data pricelist
QOF datasets
Datasets used to make CMO annual report on the nation's health for 2011
NHS Atlas of Variation (see here for more information and to view maps etc)
Marmot indicators for local authorities in England 2012 -- maps
Marmot indicators for local authorities in England 2012 -- data
Data.gov.uk NHS datasets
Kasabi NHS datasets (complete list at here)
ScraperWiki
HSCIC Indicator Portal (Population health data, GP practice data, NHS Outcomes Framework data, hospital mortality, social care)
HSCIC -- searchable list of NHS approved datasets
HSCIC -- transparency data (includes GP Prescribing Data)
HSCIC -- useful list of stuff
CfH -- major classification schemes for disease and intervention (more for bean counting than clinicians or patients)
NHS Data Hub
Government economic costing for various sectors, including healthcare, for example cost per GP visit