At the risk of being silly
Isn't this bilateral? We are repeatedly informed on how successful our professional intelligence organisations are at finding threats and we are lead to believe that we have helped prevent events in other countries in Europe.
I have no doubt that the desire on multitudinous other sides for info may exceed the desire for NOFORN data classifications. These are interesting but fundamentally stupid people expressing views which at best will do no harm and at worst get many people killed. I wonder how long it will take them to blame Brexit rather than intransigence.