What is the difference between premium economy and business class on British Airways?

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2. #generally
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5. #space
6. #premium
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8. #expensive
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10. #economy
11. #headrests
12. #greater
13. #legroom
14. #significantly
15. #different
16. #class
17. #terms
18. #superior
19. #recline
20. #business
21. #substantial
22. #offering