Nicolette, often called "Nico" for short, was the daughter of stockbroker Michael Harrison and his wife, the former Maria Madeleine Benita von Koskull, a Baltic German baroness.
[1][2] She was a debutante, one of the last to be presented to Queen Elizabeth II before the royal patronage of the practice was abolished.
[4] They made their home at Wynyard Hall and had two children: The paternity of her elder son, Tristan Alexander (born 1969),[1] who briefly held the courtesy title Viscount Castlereagh, was contested when he was about 18 months old, and he was confirmed to be the son of Georgie Fame (real name Clive Powell), with whom the young Marchioness had been having an extramarital affair.
[5] One of the Marchioness's daughters, Lady Cosima, later claimed that her true father might be the musician and writer Robin Douglas-Home.
As Nicolette Powell, the former Marchioness gave birth to a second son of Georgie Fame, James Michael, in 1973.