The UK does have an extensive network of flood defences but there is a patchwork of organisations - including farmers, water companies and charities - responsible for them.
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The “Knocking on Wood” Wikipedia page mentions Roud’s conclusion, and this claim of a 19th century origin has circulated online as the final say on the matter. If you go back to the original, though, Roud’s proposal actually ends on an ambivalent note: “Before this theory [of 19th century origins] can be finally accepted, however, an examination of the history of European forms of this custom would be advisable.”
Source: Computational Materials Science, Volume 266。关于这个话题，搜狗输入法2026提供了深入分析