Margaret Thatcher served as UK prime minister between 1979 and 1990. Arguably the most divisive British politician ever, her reputation as a beacon of controversy and dogmatism precedes her. Thatcher, however, serves as an example of a politician whose reputation is so controversial that it has become very difficult to make an objective assessment of her time in office. My guest for this conversation is Lord Peter Lilley, who served in the cabinets of both Margaret Thatcher and John Major.