Which site lead to most high-quality leads? The most common freelancing sites just seem like a race to the bottom, competing only on price with developers in developing countries (heh)
For me it's http://www.jobsite.co.uk. The contracts are onsite, normally 3-6 months, sometimes rolling. Devs are popular with digital media agencies because the projects are short term. However, I don't know how in-demand devs are. Sysadmins/devops with automation and cloud experience are though.
If you use a recruiter then under UK law you have to sign up with an umbrella agency or run your own limited company as they aren't allowed to work with sole proprietors.
If you use a recruiter then under UK law you have to sign up with an umbrella agency or run your own limited company as they aren't allowed to work with sole proprietors.