To get a UK Global Business Mobility visa in the Service Supplier category, you need to get 40 points (annual salary is not counted for this immigration category):
Certificate of sponsorship – 20 points;
Appropriate qualification for official employment or freelance work – 20 points.
The second requirement is the same as for the Senior or Specialist Worker visa if services are provided through a foreign company with a UK subsidiary. If they come to the UK under an international trade agreement, the Home Office must make sure that an applicant has relevant qualifications for the work they are to perform.