When was the 9 o'clock watershed introduced?

Related questions

1. Who is Ofcom accountable to?
2. Is there an ombudsman for BT?
3. Does Ofcom regulate BBC?
4. How many TV stations can one company own?
5. Is there an ombudsman for telephone companies?
6. What are Ofcoms aims?
7. What is broadcast regulation?
8. Can I dispute a charge for services not rendered?
9. Who regulates TV stations?
10. What is Ofgem?

Tags

1. #consolidation
2. #london
3. #based
4. #which
5. #hilde
6. #acted
7. #watershed
8. #economics
9. #including
10. #research
11. #report
12. #recommended
13. #school
14. #channels
15. #introduced
16. #professor
17. #responsibly
18. #television
19. #himmelweit
20. #child