A guide, written by a prisoner in 2015, provides useful information here
If a guilty verdict is given, the defendent will be taken to a high category prison immediately. There will be no further contact with family members. It’s a good idea to take a packed bag with you to court if you think you may be getting remanded or found guilty. Every prison is different so you may not be allowed to keep some (or ANY) of the things packed. The rules change every day and with every staff member so it’s totally unpredictable. If found guilty, you will be returned to court several days later for sentencing.
Upon arrival at the prison you should be allowed to make a free phone call, although it’s hardly worth it as it lasts literally a minute.
If found guilty, you will be returned to court several days later for sentencing.