This is not a racist issue it's a matter of legality. It does not matter where you originated from as long as you enter the country in the correct way. The main problem is that the legal system in the UK is flawed when dealing with illegal immigrants in that even when caught, instead of ejecting them from the country immediately they are simply told to go back out on the streets, get a lawyer (who immediately claims legal aid for them) and to 'report' occasionally until a hearing is convened to deal with them, which could be 2-3 years later. Invariably that is the last that is ever seen of them as they disappear into the underworld network of like minded people.