He has been voted the greatest Briton of all time – a heroic wartime leader who took on Hitler against the odds. But Winston Churchill, it seems, is no longer so universally admired. Just one in five 18-to-24-year-olds say they have a positive view of the former Prime Minister, compared with 58 per cent of over-65s, a poll has revealed. Educational experts say the findings are down to changes to the school curriculum, which have led to Britain’s past being portrayed in increasingly negative ways. The survey, commissioned by the think tank Policy Exchange, revealed views of history depended not...