The girl from Patagonia would not be refused entry and sent back without good reason. Believe you me, immigration officials are not simply allowed to refuse entry to would-be visitors just on a whim. Even if a passenger is rude and abusive, refusal is simply not allowed by law. There would have been incriminating evidence of some kind, either verbal or written, that convinced the IO that more than a visit was intended. The IO would then refer the case to a Chief Immigration Officer who would have had to also be convinced that the evidence suggested that more than a visit was intended. UKBA officials are not stupid but neither are they uncaring automatons. They take the Government shilling and they do the Government's work. But, they are not allowed to bend the rules to simply refuse entry to someone who meets the rules. As regards the Certificates of Sponsorship for artists, as plenty of posters have said earlier, it is actually quite simple if you take the trouble to read the UKBA website - and it makes life easier for those who do.