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To mark the opening of the much anticipated, revamped Tate Modern, with its new Switch building more than doubling the amount of space it has on London's Bankside, a look behind the scenes to reveal new director Frances Morris' drive to increase the amount of international, female and performance-related work to make it a museum for the 21st century. With exclusive access to the Tate's 'secret stores', where some of the new work will come from, members of its congregation explain how they feel the �260m transformation of this cathedral to contemporary art is money well spent, while others think its expansion in a time of recession is sacrilegious. Andrew Marr and Brenda Emmanus present with contributions from Tate supremo Sir Nicholas Serota, artists Tracey Emin and Antony Gormley, critics Waldemar Januszczak and Jennifer Higgie, and painters Harry Hill and Vic Reeves.