Definition of Fair Dealing according to the Intellectual Property Office:
In certain circumstances, some works may be used if that use is considered to be ‘fair dealing’. There is no strict definition of what this means but it has been interpreted by the courts on a number of occasions by looking at the economic impact on the copyright owner of the use. Where the economic impact is not significant, the use may count as fair dealing.
So, it may be within the scope of ‘fair dealing’ to make single photocopies of short extracts of a copyright work for non-commercial research or private study, criticism or review, or reporting current events.