The Scottish Parliament Information Centre (SPICe) produces research briefings on a wide range of issues, including on EU and International Affairs. These are intended to aid Members of the Scottish Parliament (MSPs) by providing relevant impartial up-to-date background material on topics relevant to their work. However, the briefing papers are useful to anyone starting to research a current issue.
SPICe also produce a blog which has a section devoted to the UK decision to leave the European Union. A useful feature is the weekly update on current developments following on from the decision to leave.
The latest update from the 30th of November 2017 is available here.