When you go out after picking up the box, if you are unlucky, there will be an entry check, and there will be those dogs with terrible smells at the door. Anyone in doubt will be opened for inspection.
Manchester City Airport may be better and not so strict. I always get off the plane from Heathrow Airport and I arrive very early, so I have never encountered it. But my friend was warned. And fined.
Food restrictions in the UK:
1. All meat products (whether fresh, dried, pickled, cooked, refrigerated, powdered, canned, or vacuum), So my favorite sausages cannot be brought in. In fact, I could bring these when I first came to the UK about 6 years ago
2. Dairy products (milk powder)
3. Potatoes
4, seafood whether fresh, dried, pickled, cooked, refrigerated, powdered, canned, or vacuum)
5. Fruit
6. Medicines can be brought but cannot be opened.
7. The UK also has restrictions on instant noodles, so you can’t bring too much.