Much, presumably, to the posthumous chagrin of her hero, Geri Halliwell has revealed herself as a lady all too ready for turning. On Thursday the Spice Girl explained why she had deleted a tweet mourning the death of Margaret Thatcher – and indulged in some self-flagellation. When news of Thatcher's death broke on Monday, Halliwell tweeted: "Thinking of our 1st Lady of girl power, Margaret Thatcher, a greengrocer's daughter who taught me any thing is possible…x." However, when her tribute met with a hostile response online, the singer removed it and apologised for any offence it had caused. Three days...