'My mother-in-law Annie lived with us for 17 years and was picture-book perfect.' It took a while before the family realised that Annie was increasingly (as she would put it) 'Mutt and Jeff'. So Phyllida began to write out the day's gossip at the kitchen table, putting her notes by Annie's bed before going to hers. One night as her husband wandered off to bed he muttered darkly that she spent so much time each evening writing to Annie she...