What is the process for my Thai girlfriend to obtain a visa to visit England?

To bring your Thai girlfriend to England for a couple of months, she will need to apply for a visitor visa. It's important to demonstrate that she has strong ties to Thailand, such as a job or family commitments, which ensure her return after the visit. It's not necessary to book a flight before applying for the visa, and while you can consider using an agency for assistance, many find it feasible to handle the process themselves.