Part of the White season about ethnicity in Britain. About a million Eastern European workers have come to work here since the EU opened up: one of the biggest migrations to Britain in decades. Some people in Peterborough claim that their city is being 'swamped'. But others say these migrant workers are boosting our economy and supporting our flailing pensions system. In fact, many Polish cities now want their workers back, particularly to build the stadium for Euro 2012. Tim Samuels investigates. For related archive programmes visit http://www.bbc.co.uk/archive/white.