When was Britain cut off from mainland Europe?

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Tags

1. #eventually
2. #until
3. #upland
4. #least
5. #european
6. #became
7. #remained
8. #mainland
9. #dogger
10. #doggerland
11. #peninsula
12. #submerged
13. #around
14. #island
15. #british
16. #cutting
17. #previously