“For the purposes of sections 50A to 51D above – … (c) an either-way offence is related to an indictable offence if the charge for the either-way offence could be joined in the same indictment as the charge for the indictable offence; (d) a summary offence is related to an indictable offence if it arises out of circumstances which are the same as or connected with those giving rise to the indictable offence.”