Her father is the son of the physicist the 4th Baron Rayleigh by his first wife, Lady Hilda Clements.
The oldest son of John Lyon-Dalberg-Acton and Daphne Strutt, daughter of Robert Strutt, 4th Baron Rayleigh, he was educated at St George's College, Harare in Zimbabwe and at Trinity College, Oxford, from which he emerged with a Bachelor of Arts in 1963 (later, he would receive a Master of Arts from the same institution).
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