Many readers will already be aware of the University of Durham E-Theses repository, where digital copies of dissertations are made available. But there is also a larger institutional repository, Durham Research Online, which allows one to search and find not only theses but also articles and other materials written and published by Durham academics.
Visit http://dro.dur.ac.uk/ and take a look. And if you are local to Durham, you may also be interested in the Lindisfarne Gospels exhibit!