If you are an overseas visitor in the UK, you can still access NHS services, but the process is different. First, visit the NHS website or contact the local NHS authority to learn about the registration process. You will need to provide your passport and details about your stay in the UK. Depending on your circumstances, there may be charges for certain services. It's advisable to clarify these details before seeking treatment to avoid unexpected costs. Make sure to keep all relevant documents handy.