Former British PM Margaret Thatcher is suffering from dementia, a new book by her daughter has revealed. Carol Thatcher describes in moving detail her mother’s gradual loss of memory which began in 2000 and the ‘Iron Lady’ of Britain’s struggle to remember even the simplest facts in her life.“I had always thought of her as ageless, timeless and 100 per cent cast-iron damage-proof,” Carol wrote in her memoir A Swim-On Part in the Golden Bowl. She has recalled how she first noticed slips in her 82-year-old mother’s memory during a luncheon meeting in 2000 when Thatcher suddenly got confused between the Falklands and Bosnia while talking about the war in the former Yugoslavia.“It’s not always easy to make lunchtime conversation with a mother who for decades has had international statesmen to engage with in potentially world-changing discussions.“But she soon became confused, and a few sentences later discussion of Bosnia had moved to the Falklands as she muddled the Falklands conflict with the Yugoslav wars. Watching her struggle with her words and her memory, I couldn’t believe it,” Carole wrote.