Guidelines for Adult Organ and Tissue Donation. UK Intensive Care Society, 2005.

Generally superseded.
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Organ Donation in the 21st Century: time for a consolidated approach. British Medical Association, 2000

Unsuccessful but some of the ideas found their way into the 2008, Organ Donation Taskforce report.
Historical UK Codes of Practice for the Diagnosis of Death
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Third UK Code of Practice for Diagnosing Brain Stem Death, 1998

Emphasis on the brain stem.
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Death entails the irreversible loss of those essential characteristics which are necessary to the existence of a living human person. Thus, it is recommended that the definition of death should be regarded as ‘irreversible loss of the capacity for consciousness, combined with irreversible loss of the capacity to breathe’. The irreversible cessation of brain stem function (brain stem death) whether induced by intra-cranial events or the result of extra-cranial phenomena, such as hypoxia, will produce this clinical state and therefore brain stem death equates with the death of the individual.
UK Code of Practice, 1998
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Second UK Code of Practice for Diagnosing Brain Stem Death, 1983

(No digital file available)
Clarification in 1979 to the first code to specifically acknowledge that brain death is death.
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First UK Code of Practice for Diagnosing Brain Death, 1976

Very little has changed in the diagnostic criteria over the last forty years.