How am I going to ck. the legitimacy of a company based in United Kingdom?

I replied to a job ad & emailed. A certain Mr. Boa Bush replied & claimed that he is the owner of Zenith Art Gallery in London, UK. He is in a business for quite sometime and dealing w/ international transactions. He said he had difficulty in collecting payments in checks & money order from US, & he is looking for a trustworthy person to accept, encash then wire transfer the remaining $ less my 10% fee + wire transfer fee to them. By this arrangement I had a bad feeling that this is a "SCAM" bec. to be an established business, having a checking acct. is a must for collection & payment purposes. I don't even know if the person I am dealing with is the legitimate owner of the said company, also what the job ad is looking for is an home acct. manager, bookkeeper & sales representative, diff. from what Mr. Bush's job descriptions. I knew that I will be in trouble because I will be the one to indorse the ck. I have the company's address & tel.#. I want to warn the public.