SEO (Search Engine Optimization) will help your website appear on top of search results on major search engines such as Bing, Yahoo or Google. For example, whenever you search using any keyword, some search results appear on top of the list and others are buried at the bottom of the list or even in other search result pages. The aim of SEO is to make sure that your website appears on the first search result page and on the top of the first page. It is a known fact that internet searchers will never go after the first page. This is why it is said that if your website does not appear on the first page, then it does not exist in the eyes of searchers.
SEO consultant London will optimise your website around a specific set of keywords and sub keywords and will optimise your website to be more search engine friendly and your website will pop up on top of the list for your niche related keywords (the phrases that your target customers may search for). That will generate more traffic to your website and may turn your sales on
Source : http://searchengineoptimisationlondon.weebly.com/1/post/2013/05/the-reason-behind-using-the-service-of-an-seo-expert-london-company.html