Not sure if anyone has already mentioned it but the simple and obvious deterrent is to reduce the financial benefit of settling in UK to the same level as is enjoyed settling in any of the other countries that many of the people in question will have travelled through to reach the UK.
Those with genuine reason to want to enter the UK would no longer be competing with those who could freely choose from several other countries which would at that point provide a similar welcome to that of the UK.
Or look at the countries that these asylum seekers are coming from and try and make those countries more attractive to stay in, so they don't leave in the first place?
Better for everybody?
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