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It is not allowed:
If you are travelling from a country outside the EU, you cannot bring any meat or dairy products into the UK unless you are travelling from the Faroe Islands, Greenland or Iceland, when you are allowed a combined weight of up to 10kg per person. You may bring in a limited quantity of other animal products, such as fish, bivalves, honey and eggs.
See this handy PDF (quoted above) for more information.