Unidentified flower

Please can someone kindly tell me what this flower/plant is. We moved house nearly a year ago, but this is the first time we have seen it in our front garden, as it is in a border full of geraniums and other plants, which are going mad at the moment with the sunshine/rain we're having! It has a long very stem, with small 'clover' like leaves, and then this gorgeous flower emerges at the top!
Thank you, Carol


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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.