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For most websites, being accessible to Google is probably the most important requirement. The only way that this can be done is to build it into the website from scratch and if anybody rings up and tried to sell you something else...don’t believe them.
The Google algorithm is so big and complicated that even the people in Google who work with it, do not understand exactly why it generates some of the results.
The safest criteria is to be absolutely straightforward in trying to deliver good content to your customers and employ best practices.
We build all of our websites from the groud up to be as SEO friendly as possible by using all of the methods that we have tried and tested and have proved to work time and time again.