Islay, you have no need to answer my post, just keep looking at answers if any, then knock that chip off your shoulder and put in ( If you want) a comment.
Around 20% of the houses where I live seem have very large families (often 3 generations) and most seem to be of Pakistani origin. I have never asked them whether they are immigrants or whether they were born here. I also work with pupils who could be immigrants but again I haven't checked further. There have been some Syrians joining local schools recently an i know they are immigrants because they came via a local 'orientation' centre- all so far seem very polite and willing to learn and so stand out as unusual in some schools