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>So far I've got as far as running the report wizard in visual studio 2012 so opne to suggestions. Though I think its going to be running as a scheduled job in SSRS.

OK. In a nutshell, you have to

1) Create the report in Visual Studio (either using the wizard, or starting with a blank report)

2) Deploy the report to a report server

3) Create a subscription to export the report (on a schedule) to a CSV file (or some other format). It does require taking the deployed data source on the report server and supplying stored credentials. A scheduled SSRS job won't run if the data source is simply using windows authentication - you have to supply credentials for the data source for the job to run unattended.