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There is nothing you will be able to do from the UK. He can call and find out if there is a warrant for the assault accusation. If not, there is no charge. He will not be arrested for the outstanding traffic citations, but if he does not show up to court, a warrant will likely be issued.
Hiding will only postpone the inevitable, he will be arrested eventually. It is better to go to court when he knows the possibility exists, at least he will be prepared... rather than being arrested some day on his way to the grocery or something.
The public defender cannot help him until a charge is filed, and the court appoints the public defender to represent him. You cannot just call them up and have them represent you.
You can respond right here.
I see. Well, if he has a valid prescription, he should get it in jail. If he has warrants, he will be arrested when he goes to court. If he already has a PD, the deal they negotiated is probably the best he can do.
I cannot recommend hiding out. He might call his PD, and ask them to make sure he gets his meds in jail. Like I say though, they should give them to him.
If he is afraid the police are going to rough him up, it would be better to present in court, rather than be picked up unprepared. This way he can arrange him medications, etc, too.