'Copyright' isn't the issue with images of people (since a persons face cant be subject of copyright). The need for a model release is to do with 'Commercial' rather than 'Editorial' usage.
If its Commerical use (endorsing a product) , the need for a model/location release arises because of future risk of either payment being demanded or defamation, privacy, publicity rights being claimed by the subject. There is an extensive FAQ by the Editorial Photographers of the UK (see 'why might I need a model release') and also about Copyright more generally.
For copyright the British Press Photographers Association also has detailed summary of the law. Its worth noting current rules are from the 1988 Act. A section details the rules prior to this (1956 act being the previous one).
Another point is to ensure any exhibition captions are 'neutral' to avoid libel claims.
I'm far from an expert in UK law, but I don't think copyright law should be your concern here.
Photographers face legal issues that we never give a minute's thought to when I work as a painter/artist. No one is going to be concerned about their image there, it's all an interpretation.
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