I don't know if this is too much of a problem since the UK (and presumably the nordics) have had bumper harvests this year and the EU still subsidises the bloc when they can't produce crops due to weather conditions so I imagine imports can be sought fairly easily.
After France my country is largest EU agro producer ... expect high prices on food this winter , a river next to me that is big in my country , you can now cross on the other side like it's nothing ... same for the Danube... crazy year