Why are gherkins called wallies?

Related questions

1. Are pickled gherkins one of your 5 a day?
2. What is the real name of the Gherkin?
3. Why are pickles called gherkins?
4. Who invented the pickle?
5. Should epics have acceptance criteria?
6. When should you pick gherkins?
7. Are gherkins good for gut health?
8. Are gherkin pickles good for you?
9. What is inside a gherkin?
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Tags

1. #brought
2. #barrels
3. #immigrants
4. #began
5. #originally
6. #century
7. #pickled
8. #cucumbers
9. #slang
10. #london
11. #olives
12. #liking
13. #corruption
14. #wooden
15. #eastern
16. #wallies
17. #mostly
18. #which
19. #european
20. #referred
21. #olive
22. #arrived