From what I saw on TV the Earl of Ulster arrived with his sister Davina, followed by his sister Rose and her husband.I didn't see Lady Ulster.she wasn't with him at the Remembrance Service for Prince Philip either. I know she is a Medical Consultant so she may have been working.
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And the Daily Mail misidentified Lady Helen and Tim Taylor as Mr & Mrs James Ogilvy. I saw the Ulsters and his sister Rose with husband.