"Must be true Zacs, I saw a Turkish guy in our Kebab shop earlier. Terrified I was :/"
If you go to some parts of London (particularly North London, and I can direct you quite accurately) you will be lucky to see somebody who is not Turkish.
Yes, "overrun most of mainland Europe" is a trifle dramatic. However, "populated many areas almost exclusively to the extent that you would not think you were in Europe" is perhaps more apposite. Try many parts of the UK, Sweden, Germany, Italy, France and Greece. These are my own observations, not reports from the press.
If the EU was to be properly invaded (as opposed to invaded by stealth by people who are being allowed or even invited to settle) it would take the Euromaniacs so long to decide what to do the continent would be overrun in very short order.