The BBC has pulled together a briefing on immigration as part of a new series of in-depth online guides analysing the big issues in the news. The Briefing has had input from academics, researchers, journalists and statisticians and its writers have consulted government bodies in the UK and overseas, think tanks and affected communities to reflect a broad range of perspectives. It looks at the history and trends of immigration, the impact on the UK economy and public services, public perceptions and policy responses. You can access the briefing here.