Companies that can help you get a work visa?

I have a quick question...are there companies that I can go through that will help place me in a job in the UK? I don't care if they are expensive. It would be worth it.

As far as I know, Work Permits must be obtained for you by the UK company you will be working for.  Ergo, you don't get a Work Permit unless you have already accepted a job offer from a UK company, and the WP is tied to that company (if you leave that job and accept a job with another UK company, the new company must get a new WP for you.) 

If you have skills that are in high demand in the UK, you may qualify for a WP under the HSMP (Highly Skilled Migrant Programme.)  Sorry, I don't have any links for you, but search for HSMP and I'm sure you'll find lots of info.