Thought I would share this very useful summary of copyright developments over time from DACS :
https://www.dacs.org.uk/latest-news/copyright-uncovered-photographs?category=For+Artists&title=N&utm_source=DACS+General+Mailing+List&utm_campaign=f7a41f8e79-DACS_newsletter_Q1_2018&utm_medium=email&utm_term=0_de159500fe-f7a41f8e79-223246869&mc_cid=f7a41f8e79&mc_eid=abf8554838
https://www.dacs.org.uk/knowledge-base/factsheets/copyright-in-photographs
Marc