Recuitment agencies for independents

None whatsoever.

No agency finds you work. They all find people to fill vacancies. Don't ever think that an agency is there for your benefit.

Freelancers tend to be specialists, so "all fields of work" agencies are best avoided, as they tend to have no understanding of the specialist requirement that they are trying to fill. Some do have specialist departments though, often under a different name.

Look on www.jobserve.com as a web site but there will be multiple agencies on there.