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I've been meaning to talk about this picture and the Tiaras worn for some time now and I'm glad you brought it up 992234177! Lady Leicester's Tiara and Necklace were recently discussed on here but I have an intriguing observation about Lady Glenconner's Tiara which I believe is the Abergavenny Tiara worn by the Marchioness of Abergavenny, another one of the Queen's Ladies-in-Waiting!