Build your resume. In order to find work in the highly competitive world of the London theatres, you will need to have a formidable resume. Your resume should include numerous credits with respected theatres. In addition, you are more likely to find work if you have extensive an educational background, including BA or BFA degrees, Master's degrees, and master classes with famous theatrical personalities.
Familiarize yourself with the differences between theatre in your country and theatre in London. For example, technicians should note that there are many differences in terminology, technology and measurements between U.S. theatres and theatres in the U.K. For actors, you should familiarize yourself with various accents, British playwrights and other key differences. Try and learn as much as you can about the London theatre scene via the Internet, theatrical journals and actual people working in the London theatre.
Formulate a budget. You will need to have substantial savings to defray the cost of moving, and to help you feed and house yourself while you are looking for a job in London.
Obtain a passport. U.S. citizens can do this via a local post office for a fee.
Obtain a visa, which will enable you to be hired in the U.K. See the Resources section for additional information because U.K. standards for working papers may have changed. You can either get a work visa yourself, or if you are sponsored by a U.K. theatre, they can help you make the proper arrangements.
Search for a job opening. Research some theatres you would like to work at, and contact them with your resume, headshot, CV, portfolio, etc., via email. If you are lucky, and your resume is impressive enough, you may be able to land a job offer in London before you leave the county.
Examine U.K. publications and websites for job listings. Some U.K. theatrical publications of note include Total Theatre, The Stage, StageJobsPro and Musical Stages. The Guardian newspaper/website also has a classified section that lists theatre jobs.