He has to be there for 2pm, but his case could be called then or at 4pm, depending on court business.
I would advise him getting there for 1pm to get some advice. The advice is free, but the solicitor may not go in to court to speak up for your son.
Unless there is a significant risk of custody from his reading, the solicitor cannot claim for being in court so he may just give advice to your son about what he should say himself when he goes into court.