I'm sorry to hear about your friend. You have asked a number of questions which I will reply in order: Yes you should apply for bail. You can get the form from the First-Tier Tribunal (Immigration and Asylum Chamber) website and accompanying guidance. 2) the UKBA will need to make a decision on whether to curtail his leave and give directions for his removal which he ought to appeal to the Tribunal relying upon article 8 ECHR. 3) If he were to leave voluntarily, it is likely that he will not be able to reenter immediately as you put it. Rather he will need to reapply if his leave is curtailed and is likely to be refused on general grounds for past breach of the conditions of his leave. 4) To be a sponsor he would need to have settled status (that is indefinite leave) at least.
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