Office Work
If you've got some computer skills and are in a big city where you speak the language and have a proper work visa, temping in offices is a good way to get by. You'll probably be working 9am to 5pm which leaves the weekend for getting a bit ruckus. The pay is usually better than retail and in London you probably won't be earning much less than £7/hour.

As a temp you may be placed in offices for short stints or might get lucky and find some longer termed placements. I temped for a year at the same place in London. If you're doing shorter jobs, make sure to register with several agencies as you might find yourself out of work during slow periods and the more places that have you on the books, the better your chance of minimising unemployment.

To get signed on with agencies you'll have to show them your resume and then set up an interview to be held at a later date. The interviews usually consist of a variety of tests which will always include a typing test and might also have math, spelling, Word, Excel and data entry among other things. From there you either wait for them to get back to you with work or, if you're really desperate, you stalk them every other day asking when they're going to find you a job.