Extraordinary open letter from Vince Cable"s wife Rachel Smith hits back at MoS columnist who wrote of "alien nation" – and backs…

Britain needs immigration: Extraordinary open letter from Vince Cable's wife hits back at MoS columnist who wrote of 'alien nation' – and backs husband's mansion tax Rachel Cable responds to provocative column by Peter Hitchens'Most newcomers are either students or migrants with skills Britain needs'Mansion tax 'would help bridge widening gap between rich and poor | UPDATED: 22:42 GMT, 22 December 2012 Vince Cable's wife Rachel wrote an open letter defending Britain's immigration policy and backing her husband's policy of a mansion tax The wife of Business Secretary Vince Cable has written an extraordinary open letter defending the UK’s stance on immigration – and backing her husband’s controversial idea of a mansion tax. Rachel Cable was responding to a provocative polemic in last week’s Mail on Sunday by Peter Hitchens, who argued that British society was undergoing an irreversible transformation. Our columnist drew on recently released census data to highlight the decline of the UK’s manufacturing industry, London’s increasing detachment from the rest of the country, the decline of Christianity and marriage and the cultural changes wrought by immigration.