If you are considering applying for a specific master's program, I suggest you read the detailed description of the course and the admission requirements carefully, and usually make clear the graduation requirements. This information may include whether it is necessary to write a graduation thesis, as well as the length and subject requirements of the thesis.
Generally speaking, graduation thesis is usually a common graduation requirement in British master's courses, but not all master's courses require students to complete the traditional long graduation thesis. Some courses may pay more attention to practical work experience, research projects, internships or other practical applications.
If you have decided on a specific master's program, you can contact the Admissions Office, the course director or the tutor directly to get more detailed and specific information about the graduation requirements. This will ensure that you understand and meet the requirements of the course.