Ethnic Minorities in Politics, Government and Public Life (PDF) by John Wood & Richard Cracknell was published by the House of Commons Library in October 2013.
It finds:
There are currently 27 minority ethnic MPs in the House of Commons; 4.2% of the total. The UK population is becoming increasingly diverse in terms of ethnicity. The 2011 Census showed 18% of the UK population reporting a non-white background. This compares with 8% ten years earlier. However, despite an increase of 15 minority ethnic MPs between the 2001 and 2010 general election, the diversity of MPs remains disproportionate to the population as a whole.