The operations of EGR313 are overseen by Waddington and, because it is a permanantly active restricted area, unless Humberside are told otherwise by Waddington they have to assume that it is active.
I don't know if this is still in the Humberside MATS Pt2 but it used to be.
If you're ever in this position again, I would recommend that you either ask Humberside to clarify with Waddington what the score is, or even better, contact Waddington on your 2nd box to ask them directly.