Your search term is 'Doggerland'.
As I recall there was a massive landslide, but depending on the timing it was the
coup de grāce. Mostly it was glacial melt water. London was under kilometers of ice at one point
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https://www.internetgeography.net › topics › what-was-the-extent-of-ice-cover-across-the-uk-during-the-last-ice-age
What was the extent of ice cover across the UK during the last ice age ...
There is no permanent ice cover in the UK today. However, 20,000 years ago, it was a very different situation when most of the UK was covered by an expanded Arctic ice sheet. The ice was three kilometres thick in places. Large bodies of ice, called glaciers flowed slowly from highlands to lowland areas. The Earth's climate warmed around ...
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Yup
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Storegga Slide
The three Storegga Slides are amongst the largest known submarine landslides. They occurred at the edge of Norway's continental shelf in the Norwegian Sea, approximately 6225–6170 BCE.Wikipedia
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Younger Dryas
The Younger Dryas, which occurred circa 12,900 to 11,700 years BP, was a return to glacial conditions which temporarily reversed the gradual climatic warming after the Last Glacial Maximum, which lasted from circa 27,000 to 20,000 years BP.Wikipedia
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6225–6170 BCE would be 8248–8193 BP.