Topic 5 and topic 4

The requirement is that the student must be able to justify their choice of company and be able to consider any limitations in their chosen company and this forms part of the assessment. So It is not possible to name some companies and make suggestions as then it would not be entirely your own work and this conflicts with the University regulations. The way you should be addressing this is by proposing some companies to your mentor and discussing your approach with them to narrow down your selection based on their constructive feedback.

I am sorry if you think this is unhelpful but we are ethically bound to adhere to the University rules on this. So if you cannot come up with your own ideas for a relevant company for Topic 4 or 5 then you should consider a different topic where you are more sure of an appropriate company.