The best source of jobs here in London and the UK, is the UK.gov's own labour service at JOBCENTREPLUS - they have the bulk of work available here in UK, in spite of what many private employment agencies will tell you and the reason for this is because they do not charge an employer a fee to put up a job on their list available via the Internet or down at the Job Centre near where you live.
JOBCENTRE PLUS
Jobcentre PlusProvides help and advice on jobs and training for people who can work and financial help for those who cannot. Site offers information on job hunting and ...
http://www.jobcentreplus.gov.uk/
I strongly recommend that you go to your own local Job Centre and sign up with them. You'll find lots of help and advice plus you will be able to claim 'Job Seekers Allowance'.
JSA - Job Seekers Allowance, is not very much, usually about £50 but it's purpose is to help you with such as transport while out there job hunting.
You can also join Job Seekers Club at your local Job Centre Plus.
At your local Job Centre, you will see a few computer screens. These are 'touch screens' for public use. You can use one of these to quickly search for jobs in your own category.
You can also do the same online.
It is FREE service to everyone.
Take a look at the video clip below. . . .
JOB CENTRE PLUS
http://www.youtube.com/watch?v=Le0yncyAyc4&watch_response
Your local Job Centre will help you find work, it's what they are good at.
GOOD LUCK - HOPE TO SEE YOU IN BEIJING!
. . . .TO THE OLYMPICS