looking into other people who are seeing 'mobile ' versions of websites using Safari and Yosemite I found this - https://discussions.apple.com/thread/6659813?start=0&tstart=0
There is a fix for it but by the looks of it, it has to be manually done. However if someone just goes on a website using an imac aand sees the mmobile version they are hardly going to bother wasting time going through the fix and will most likelly move onto another website.
So basically what I am saying is - is 'everyone' that visits that site using safari going to see the mobile site and if that is a yes , how do I resolve it ?
Thanks