Scotland produces 80% of the UK’s seed potatoes. It’s an excellent industry with many years of expertise producing a quality product where 13.5% of its sales are to the EU.... (Brexit) means that seed potatoes from Scotland will lose their EU market – they will not be allowed to sell their products in the EU as they did before. They will have to rely on sales within the UK to make up this loss.  BUT to make matters worse  EU countries will be able to export their seed potatoes without hindrance onto the UK market.
https://theorkneynews.scot/2018/11/10/brexit-concerns-raised-over-scotlands-successful-seed-potato-sector/