Oh dear, the Halo has slipped – or is it the Crown? Lady Diana was the People’s Princess, Kate Middleton was the perfect Princess. A discreet, devoted wife, a caring mother, a dutiful public servant. Since she entered the Royal Family, she really hasn’t put a foot wrong. But it’s all come crashing down with a wildly photoshopped Mother’s Day image. I’ve got to say, before the veracity of this image was brought into question, it was already raising eyebrows, with many including the excellent broadcaster Julia Hartley-Brewer noticing Catherine was not wearing her wedding or engagement ring. Now …