Too late for the original poll, but I feel the Monasteriat would wish to know the latest: It was the tree's fault (https://www.dailymail.co.uk/news/article-8603783/Workmen-erect-street-light-middle-TREE-bosses-blame-tree-blunder.html).

Regards,

John Davies

Update 2021-12-09: And we have another contender: the wrong kind of wind. https://www.dailymail.co.uk/news/article-10290621/Wrong-kind-wind-blamed-blackout-left-thousands-families-without-power-week.html

Update 2022-01-15: Another one: the wrong kind of sunlight. https://www.dailymail.co.uk/news/article-10404837/Now-train-operators-blame-wrong-kind-SUNLIGHT-rail-chaos.html

Update 2022-04-07: The wrong kind of air. https://www.dailymail.co.uk/news/article-10695233/Cracks-Hitachi-Class-800-trains-caused-excess-movement-salt-corrosion.html