If you're a skilled professional or if you have experience in a particular field, you then don't want to register with any old recruitment agency, you would like to find one that will develop the sort of positions that you would be interested in, if not the only jobs you might be offered may simply be inappropriate for the skills and experience.
There are Visit this page of specialist agencies on the market, most of which are available on the internet. If you are a marketing guru, a person who is skilled in one of the many areas of construction, or you are a chef etc then don't go for a recruitment agency that does 'everything' you need one which specialises in your field.
Basically homing in your search when on the internet, should assist you to locate the right sort of agency. In the event that you just type in recruitment agency, you will have literally thousands of options to find through, but in the event that you enter 'Construction Recruitment Agency' then this can start to narrow your options down.
Basically though, some of the search engine results could have 'keywords' attached to them, which means that if the Webmaster for a site tags the website to be flagged up if 'construction' is keyed in, then regardless of whether or no construction jobs are on the website, the website will be high up in the search engine results, so the more specific you can be when searching, then the better it is, so if you want a construction agency that could offer you a job as a Quantity Surveyor or someone who draws plans using CAD, then enter Quantity Surveyor or CAD designer as well recruitment agency and this will soon begin to narrow down the search engine results. Therefore the more specific you will be, the better!