I am attempting to create a view that displays Content by it's current Workflow state.
I cannot see how this is possible using the Views module combined with the Workflow module.
Can you advise?
Have you enabled the "Workflow Views" module (in the workflow 'module')? With it you get a example "workflow summary" view with a list of all content with its current state, title and type of the content. In views you get access to a few new fields like "current state", "previous state", ...
If you have also enabled the node access module, make sure that in the author settings per content type administration page you set the node author to be able to view and edit
Other wise it will not show in the workflow view.