I don't think we have the weather for citrus trees in the UK
Having fruit trees makes a huge difference, my grandpa has 5 grapefruit trees, the trees aren't very big, but each one produces hundreds of grapefruit every harvest season. Just at the last week of their "fruit bearing" season, after all the low hanging stuff was gone, we picked all the high stuff and got about 10 pitchers of freshly squeezed grapefruit juice. I swear to god, don't judge grapefruit juice until you've had this real stuff. Store bought red grapefruit juice is horribly sour, but the stuff we squeezed is sweet with a tart fruitiness. Pure heaven
We're better for growing apples.