I don't think I have said any of those things.

1. I regret to way that your obsession with immigration is self-describing.
2. Your concerns lead repeatedly back to the worry that immigrants are different, are not "British". That is racism. I see no indication anywhere that you would be worried if white English emigres returned "home".
3.   I am not concerned by immigration, as I perceive it.

No, you have assumed that the decline in immigration is temporary despite the fact that there is very little actual co-incidence (that is to say occurrence at the same time), and that the world of statistics is full of happenstance correlations. I am NOT going to get out my old stats texts and see what degree of confidence there is to an alleged relationship between economic growth and net immigration. If you want to show that there is a statistical correlation, you do the arithmetic. You will still have to show a causative relationship.

Your position, Keith, boils down to wanting to keep foreigners out. Otherwise you would be wanting to address breeding habits. But you show no signs of concern about white English breeding habits: only those of the people you don't want here.