Good news first: the UK's personal alcohol allowances are generous — generous enough that a Calais supermarket run still pays for itself. The catch is food: meat and dairy from the EU can't come in at all, so the leftover saucisson can end up in the bin at Dover. Here are the rules at a glance so arrival holds no surprises.

The UK Allowances at a Glance
As a private traveller (17+ for alcohol and tobacco) you can bring these amounts into Great Britain duty-free:
Alcohol: generous limits
You're allowed 42 litres of beer and 18 litres of still wine — plus either 4 litres of spirits (over 22%) or 9 litres of sparkling/fortified wine (the two can be split proportionally). Plenty of headroom for a proper Calais wine run.
Tobacco: much tighter
The allowance is 200 cigarettes or 100 cigarillos or 50 cigars or 250 g of tobacco (splittable proportionally). Bring more and duty is payable on the whole amount — not just the excess.
Goods: £390 per person
Other goods (gifts, electronics, clothing) are free up to a total value of £390 per person. Important: go over the limit and you pay on the full value of everything, not just the part above £390.
Banned: meat & dairy from the EU
The most common trip-up: meat and dairy products cannot be brought in from the EU — including that filled baguette or the picnic cheese. Bread, biscuits, chocolate and most packaged snacks are fine.
Cash: declare from £10,000
Cash of £10,000 or more (or equivalent) must be declared when entering Great Britain. Irrelevant for normal holiday money, essential for anyone carrying business cash.
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