Does mass immigration boost our economy and cultural richness or undermine them Hear Times columnist David Aaronovitch, former Mayor of London Ken Livingstone and the economist Susie Symes go head to head with UKIP's Nigel Farage, Demos director David Goodhart and journalist and author Harriet Sergeant, over our motion 'Let them come: we have nothing to fear from high levels of immigration'. The debate took place at London's Royal Geographical Society on 10th October, 2013.