If that is your objective, let me share my knowledge and experience.
I am sitting in a remote corner in India. Still, I was able to get some advertisement for my directory which I was looking for from London only.
Being a directory webmaster, it did not take me long to locate the proper resource and I landed on London Advertising Directory. This is a directory of advertisements. One can find various media of advertising operating in London.
Actually I wanted a suitable company in London who are specialists in Animation and Graphics. I was able to easily locate them from London Advertising Directory.
For my next project, I am contemplating to approach a market research company in London for my proposed launch of spiritual gifts. I believe I don’t have much competition there. I want to take up a quantitative market research for my products.
The directory is designed with pleasing colors and uncluttered making the navigation easy. This is a niche field where you won’t find many number of directories.
For a better global exposure, this directory is a good resource.

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