She was influential in British politics as the special advisor to Kenneth Clarke and then as director of the Centre for Policy Studies.

After resigning from this position in 1995,[2] she became executive director of the Centre for Policy Studies, eventually becoming its deputy chairman from January 2004 until April 2017.

[3] In this role she contributed to, commissioned and published over 100 public policy pamphlets on the European Union, the Constitution, law and order, education, health, tax and regulatory affairs and women's issues.

On 9 January 2020, Keswick published The Colour of the Sky After Rain,[8] about her impression of the Chinese people and their culture after decades of travel to China and the Far East.

[12] Keswick was the daughter of Simon Fraser, 15th Lord Lovat and Rosamond Delves (née Broughton).