Info required for Sole Representative of an Overseas Business visa

Hi everyone,

One of my family member would like to apply for Sole Representative of an Overseas Business visa. They have an established and successful business in Dubai UAE for transportation.

Now they are planning expansion and would like to explore opportunities in UK. I have come across "Sole Representative of an Overseas Business visa" and have read the guidance. It seems pretty straight forward however I'll really appreciate if someone share their personal experience ?

Or may refer to some useful information of key areas ?

Thanks for your time and consideration.