Mrs Runner and myself went through process today.
Checks on tickets are everywhere, but only one check on ID at the entrance to course. In both our cases they only checked that the ID Photo was correct, never looked at the name on the ID OR on the ticket.
Maybe different on main days. Have heard that supervisors have accepted/approved pass through no problem where family members have tickets in other sibling names. Reckon uve a good chances of being ok. Naturally, they will not say this themselves...