There's one thing that I've stocked up on & that's decent decaffeinated coffee from "The Decadent Decaf Coffee" company. I've had to cut down to one caffeinated coffee a day this year & it's been a relief to find some decaf that doesn't just taste of damp soil & cardboard. Mind you, my favourite is grown in Costa Rica & roasted in Sussex, so Brexit shouldn't make much of a difference