Tom,
No, that was several hundred miles south, in Salisbury, Southern Rhodesia. Nchanga came after my military career.
Truth be told, she almost choked on her champagne. She had a wicked sense of humour but it wasn't much apparent at the time. She had been shipped out of Britain with the Queen Mother having fallen in love with Group-Captain Peter Townsend. Owing to his having been divorced (although in odd English parlance, he was the 'innocent party.') the Church of England and the Establishment were totally opposed to the union.
When Anthony Eden, then Prime Minister, advised her that if she decided to go ahead with the marriage, all perquisites of being a Royal would be withdrawn. She would become Mrs. Townsend, no titles, no houses, no freebies and not a cent from the Civil List. This latter meant no allowance. A devasting blow which she decided was just too much. As an aside I remember the poor late, lamented Christina Onassis, who, in one of her strange, looking for a husband mode, married a Russian. She went to live with him in an apartment together with his Mother. It went well for a couple of months but when she went to the store to but a refrigerator, the salesman said, "Fine, we'll deliver it in four years." She gave him a couple of tankers worth about six mill and got a divorce.
I am afraid Margaret was a bit of a sad case, she liked to lead a louche sort of life and be non-conformist, but woe betide anyone who treated her as anything but a Queen in waiting.
I must say she had the most wonderful bust and beautiful blue eyes.