A2 Language Investigation ideas

I am considering studying language change for my coursework, here are some ideas that I have come up with so let me know what you think! 

IDEAS:

- How language changes before and after the influence of alcohol?

- Language change in textbooks taught at different levels of education, e.g. primary science textbooks, GCSE and A Level?

- The language has been portrayed by prime ministers over the years. For example, Winston Churchill, Thatcher, Blair and Cameron?
- How has black english changed over time?

My mum's cousin may also have a selection of letters that his dad sent to his mum back home when he was in the war so I will have a look at those and consider them when thinking of a topic for my investigation :)