I am co-authoring a second edition of 'Scottish Politics' with Neil McGarvey. It will appear in 2013. It includes a reasonably revised chapter on IGR, updated to include the post-2007 SNP era and developments since 2010 (Conservative-led UK Government). The argument is still very much that IGR is generally informal and that there are perhaps far fewer major public disputes than we might expect (perhaps with the usual exception of the independence debate). The chapter can be found here - https://docs.google.com/document/d/1cixHY2OFXWiQmABedXiPE1YjVBh8aGHdL3NIJSlW25g/edit .