To see this, do a search in Google, Yahoo and Bing/MSN/Live for "plumbers in coventry" (without the quotes). Near the top of the normal (organic) search results, you'll see a list of businesses that provide plumbing services.
In Google

In Yahoo

In Bing

With more and more people using the Internet to find what they're looking for, making sure that your business can be found easily in search engines can increase sales and profitability.