Glush,
With the greatest respect and sympathy I feel it rather unfair for you to jump to the conclusion (like so many instructors are want to do) that a solo x-country student was not properly briefed. As a fellow instructor I have known a capable student pilot make the silliest of errors, or perhaps forget a detail from a NOTAM check, thus making what might appear from an outsiders point of view to be a rather alarming mistake. Brief all you like but the student will still make a mistake - it's part and parcel of learning.
PPR is required at Conington (I assume this is the airfield to which you refer) therefore I find it hard to believe that a supervising instructor would not only forget to check their student had obtained the relevant NOTAMS but also forget to call the airfield if that was the destination?!
VFE.