Choosing a topic depends on what you want to do, the guidance available, and the access you have for conducting primary research. If you plan to pursue a PhD in the future, consider the scope for contributing to the knowledge base. Therefore, my sincere advice is to conduct a literature survey first and then focus on what truly ignites your passion.
I question whether individuals would be willing to share copies of their MPhil theses. Please refer to my discussion on Research Methodology.
Have a nice day.
Regards,
Simhan
A retired academic in the UK