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As well as using physical searches Border Force officers also use sniffer dogs, heartbeat detectors and carbon dioxide probes to find people hiding in vehicles and freight.
Anyone with information about immigration crime can contact Crimestoppers on 0800 555 111 anonymously or visit their website.
Three would-be illegal immigrants have been stopped from entering the country after Border Force officers found them hiding inside a caravan at the French port of Dunkerque.
The caravan, which was being towed by a British registered car being driven by a 34-year-old man from Southampton, was searched at around 2.30am on Thursday 27 June as it waited to board a ferry to Dover.
The driver claimed to have been on a two day holiday in the Dunkerque area. Three other people were travelling with him, his wife and child and a second male aged 31.
But officers found three Afghan nationals inside the caravan - a man and woman aged in their 50s hiding in a toilet and 12-year-old boy locked in a cupboard.