SCONUL Access is a scheme which allows many university library users to borrow or use books and journals at other libraries which belong to the scheme.
To find out more about the scheme and how it works: https://www.sconul.ac.uk/sconul-access
All e-books the library subscribes to can be found in the Primo Library catalogue.
Enter your keywords and when you see Online Access against the books you're after, select to either read online or download the entire book.
Further information: How to access e-books