By Emma Revell So much of what Thatcher achieved is now taken for granted, but the free market ideas and reforming zeal she embodied are needed now more than ever, says Emma Revell Margaret Thatcher is, to put it mildly, a divisive figure. Even a decade after her death and more than 30 years after she left Downing Street as Prime Minister, it is hard to think of a figure in recent British history who invokes a more intense response – among supporters and opponents alike. Conservatives aspiring to any level of prominence inevitably find themselves invoking her policies, her name, and, on occasi…