Research: Find list of 100 companies that help people open up UK bank accounts in the UK.

This is a research project. I am looking for a list of 50 companies in the world that help overseas people get personal bank accounts and business bank accounts in the United Kingdom. These companies will have a service that helps people complete the application forms and then they go to certain banks within the UK and assist them in the opening process. At least ten of these companies must be in the UK.
I would like to know:
1.) The name of the company
2.) Which country the company is in
3.) Their website
4.) What services do they offer? Opening business bank accounts for people? Opening personal bank accounts for people?