Here are some useful links to help you to learn about copyright.

Copyright, Designs and Patents Act 1988 - details of the act

Changes to Copyright Law 2014 - explanation from the UK government of changes to the relevant sections of the Copyright, Designs and Patents Act 1988

Changes to Copyright Law 2014 - from the UK government, pdf guides on the changes in law as they affect different groups of people 

Copyright and Related Rights from the National Archives - includes section 11 flowchart of Duration of copyright - literary, dramatic, musical and artistic works (excluding Crown copyright)

Campus Library Copyright Guidance - guidance for Keele University staff and students

Creative Commons - copyright licence allowing users to share digital works under a set of conditions

CLA Licence to National Health Service in England - licence covering the NHS in England

CLA Licence Plus agreement for NHS England: terms and conditions

Copyright Licensing Authority (CLA) - licensing body as defined by the Copyright Designs and Patents Act 1988. They "license organisations to copy and re-use extracts from print and digital publications on behalf of the copyright owners - authors, publishers and visual artists."