In simple terms please 
I'm confused as usual but I've not read very much about it to be honest. From what I've read the EU have put restrictions on exports of the vaccine that is being made in the EU. One of the places these restrictions apply to is Northern Ireland. Something about concerns over NI being used to distribute vaccines outside of the intended/allowed countries? This was to protect the supply within the EU.
Ive read some of the threads about this but I'm after facts not opinion so that I can get my head round what has happened and why.
Thank you!