Have a browse through the Space directory (click on Spaces above) to see more examples of wikis at York. Try:
Digital Marketing and Communications - an example of support pages provided for a specific subject area, containing guides and other resources. Note the use of labels to produce an A-Z of categories.
Enterprise Projects Team - an example of an outward-facing team wiki (visible to all, not just restricted to the team), providing details of the work of the team, team members, and documents that can be downloaded.