According to you then every immigrant is the scum of the earth? UK population will hit 70 million at some point anyway,mainly due to people living longer.
Strange as it may seem I too would like to see the "forrin" criminals removed from the UK, as for every other immigrant, they must have the right to be in the UK so what do you propose?
As for Andrew Green and Migrationwatch, all they seem to do is manipulate and bend figures to suit their agenda. Their rantings have been disproved by better people than me.