The Copyright (Visually Impaired Persons) Act 2002 enables visually impaired people to:
Make or have made copies of copyright material in a format best suited to them without requiring copyright clearance.
Changes to copyright regulations in June 2014 have updated restrictions for accessible copying to include all works and all types of disability (eg dyslexia, dyspraxia or other physical condition that makes the use of print material difficult).
A single accessible copy of a copyright work can be made by or for a visually impaired, dyslexic or otherwise print-impaired person under the following conditions:
A copy in a suitable format is not already commercially available.
Both links contains more information.
Copyright for disabilities - useful website with audio recording.
For information on Alternative Formats see the relevant LibGuide