SEO will help get you qualified and targeted traffic, which is very important. The qualified traffic means the number of traffic that your website will get. It is a simple equation, the more traffic, the more potential buyers the more products that you will sell and the more money you will make. On the other hand, the traffic has to be targeted. For example, if you are selling mobiles, you will want to target customers from London who are looking forward to buy mobiles.
You will find many SEO consultants London, so, you will have to review a lot of them and compare between their services, packages and prices before you make a decision. There is another way to go, as you can SEO your website yourself using one of the many SEO kits and tools online. The problem with that is that you will need technical experience and SEO experience, and you may not do a good job due to lack of experience and skills on it same as the SEO firms can do.
Source : http://searchengineoptimisationlondon.weebly.com/