Originally Posted by
KenJohn
That is also why UK immigration cannot say with any certainty how many people are in the UK illegally as they do not know how many people left to compare with how many people came in.
even if they did, they still could not say how many people are in the UK illegally as this would assume they can systematically track who enters the country which, by definition, does not happen in the case of people smuggled in.
Ascertaining the number of illegal immigrants is always a guessing game.