Non-attendance of one? Take the plea, if not already done, of the one who is there Remand the one who is there, issue an order to secure the attendance of the other. If there's a reasonable chance of getting the other, then sentence both, if pleading guilty to an acceptable count, when he's produced.If one pleads guilty and the other doesn't , on the same or similar facts arising on the same indictment, remand one for sentence after the trial of the other.
Where one is holding out because his mates aren't pleading guilty, the barrister will tell the client that the client is an idiot ! If he wants to fight everything, fair enough; that's his decision; but if it is clear that he admits, or will admit in evidence, that he's guilty of s20 , then tell him that his best chance is to plead guilty at the first opportunity. The prosecution may not accept that as sufficient and hold out for a s18, in which case there will be a trial on the s18. But unless the evidence is very strong, they won't. And it counts with the jury that the man admits s20 and they are being asked a technical question about intent; they are inclined to say that he has been honest in that and give him credit, whilst asking themselves why their time is being wasted on some CPS lawyer's decision about intent and joint enterprise; the judge's direction on the latter may well seem incomprehensible anyway . They then get on with trying the others, and give them no credit at all