Lets hope IF (haha) the riot fence is in use Saturday morning and early afternoon that the club inform supporters via all media platforms, not just twitter (not everyone has a twitter account), and also announce the use of the riot fence over the tannoy too. As OUFC have previously agreed to do, as well as announced the way the will communicate the use of the riot fence to supporters.
As for who makes the call re police inside the stadium and also whether to use the riot fence (or not), I believe
@Dave T is best placed to respond as he is currently OxVox representative on the safety group ( unless there's been a recent change to that situation? )