This isn't an attempt to defend immigration on pragmatic grounds; IE., we'll let them in as long as Britain is a nett beneficiary. I would far rather argue the case on humanistic grounds and say that they are people just like us, except that they are often escaping the most unbelievable poverty, and deserve every chance they get.

However, two pieces of information worth bearing in mind:-

1. Many recent/forthcoming immigrants come from Eastern Europe. The pattern of immigration there is for people to migrate for a limited period, say four or five years, work like buggery to earn as much money as they can, and then go home.

2. Many recent/forthcoming immigrants are well educated young professionals who are moving here to start careers. I don't think anyone has established an immigration pattern for these people yet, but they are the type of people who would be a good solid asset to any nation.