Convert Wordpress School Website to Responsive Design

Require a quote to convert a Wordpress Website to a Responsive Design and port all existing content into the new design. The main website is in english and there are 6 'mirror' websites in 6 other languages. There is no content to write or functions to add, this is simply a case of converting the design to be mobile friendly. Please only reply if you are an expert in Wordpress Responsive Design and you have examples of your work online of operational websites in the UK. Many thanks. Website url is [login to view URL] (please replace the "X" with a "t")