pixie87 wrote:Was just wondering..does him not requiring a visa mean that he has more of a chance of being questioned?
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Most certainly.
Those who hold a visa have had to have their bona fides tested before they even get on a plane, which means that they can only be refused entry on arrival if it can be proved that they used deception to get the visa or there has been a change of circumstances since the visa was issued. Therefore lengthy questioning should not be necessary.
Non-visa nationals may be questioned about their entire immigration history and circumstances of their life if on arrival the IO perceives there is a problem. If your friend is in his early 20s and in a low-paid job and has no history of previous travel these are all indicators that his "incentive to return" to his own country may not be as strong as the prospect of taking his chances in the black economy in the UK.