Juries are randomly selected, independent and make decisions purely on the basis of the facts presented to them by the prosecution and defence. Jury members receive no advice or training prior to being called to serve on any case. However, they are guided and supported by the trial judge who advises them on the relevant points of law and reminds them of their role. Judges hearing serious sex offence cases are required to have specialist training.
There is guidance provided to judges in the Crown Court Compendium (a publicly available document) as to what directions may be given to juries in appropriate circumstances. This includes guidance on how to advise juries in serious sexual offence cases.