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Hi thank you for your enquiry and patience. If he didn’t complete his sentence there is more likely than not that there is a warrant for his arrest and yes they would arrest him and he would be brought before the magistrate where he could get custodial sentence. You may wish to engage a criminal solicitor to check if there is a warrant out for him but if there is there is really nothing he can do for it to disappear. When he applied tills for his visa he will have to declare all convictions in any event and the home office may find out at point of considering application that there is a live warrant. I hope this helps and I would be grateful for your rating at your earliest convenience. All the best