An 18% (roughly) population rise in 50 years with half of them immigrants doesn't bother you?

Immigration is simple.

You can't come if you can't:

1. Speak English.

2. Integrate into English culture.

3. Make a useful contribution to the economy without depriving a member of the indiginous population of his/her job.

Those three rules are fair and they will protect the locals from they drawbacks of mass immigration.

Additionally, all illegal immigrants should be automatically deported and they should not be allowed to claim asylum because if they had a case they should have done that at the border.