We are going to have to model 'our' Grand Juries on the American
System (because it is still active, and has been tried &
I say "Grand Juries" (plural), because I see no reason why we should
be limited to one ... any more than the Crown Courts (in total) are
limited to one Petty Jury between them.
I would see "A Grand Jury per Crown Court" as being reasonable.
In other words a Grand Jury for the same area as each Crown Court.