we have had people come to Britain, it may be they are asylum seekers or bunked in on the back of a lorry, they are not ones who can be put to use, if they have no skill sets we really need. they will need housing, and no i am not being hard hearted, they may come because of poor conditions in their countries, but as been pointed out too many times, we have finite resources, and simply cannot support more and more people wherever they come from.
as to birth rates, most seem to agree that it is largely ethnic minorities who are pushing up the birth rates, which means more resources on hospitals, schools, housing. I have only to look locally to see the problems of having people from one community only, parts of the area looks like a ghetto. If the people who have come in recent days don't settle permanently, and eventually go home, and there is a possibility, where will we be then, if we are relying on their future incomes.
it also makes no sense of millions of people languishing on the dole, with millions more arriving.