Yes, you must have a valid UK work visa to work in the UK. If you live outside the UK and want to work there, you usually need a work visa. The Skilled Worker visa is the most common option, and you'll need a job offer from a company in the UK that is licensed to hire foreign workers. If your job is on the Shortage Occupation List, you'll have lower salary requirements and pay less for the visa. You’ll also have to show that you speak English well, provide biometric info, and submit some documents, including your Certificate of Sponsorship. Once approved, this visa lets you live and work in the UK for up to five years, and you might be able to settle or extend your stay depending on your job situation.