If you need an example of why to check each agency out look at the varying rates of the following contracts on Jobserve. The rates vary from inspecified and £400 - £700 per day.
Search IT http://www.jobserve.com/W4807BF4C99573348.job Market Rates
Glotel http://www.jobserve.com/W7ECC64B4E3829CF8.job £600-700 per day
Capita Resourcing http://www.jobserve.com/W75542653B064066B.job £400-500 per day
Real Time Consultants http://www.jobserve.com/W0160E71630E6FB99.job No rate specified
NES IT http://www.jobserve.com/WF1DF645884432487.job No rate specified
Search IT http://www.jobserve.com/W4807BF4C99573348.job Market Rates
Glotel http://www.jobserve.com/W7ECC64B4E3829CF8.job £600-700 per day
Capita Resourcing http://www.jobserve.com/W75542653B064066B.job £400-500 per day
Real Time Consultants http://www.jobserve.com/W0160E71630E6FB99.job No rate specified
NES IT http://www.jobserve.com/WF1DF645884432487.job No rate specified
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