Google has recently made a major update to its mobile search algorithm in a move expected to cause ripples across the web.

Websites not deemed mobile-friendly will be dropped down the search rankings, dramatically reducing the number of visitors to a site.

Microsoft and the European Union are among the organisations likely to be negatively affected by the changes to Google’s secret search formula.

People can check whether their website is classed as mobile-friendly by Google by entering the web address here.