The contribution that Crispin Tickell made to awareness of the dangers of climate change was helped by events during his ambassadorship in Mexico (1981-83), where I served as his No 2.
When Margaret Thatcher went as prime minister to the one and only North-South summit in Cancun in October 1981, she was clearly impressed by Tickell’s coolness under fire, his scientific understanding and no nonsense approach to foreign affairs. He was someone she would now listen to.
