On 19 May, the Department for International Trade published the Tariff which will replace the EU External Tariff after 31 December. The tariff rates will apply to imports into the UK unless some exemption or preference applies. It does not cover import VAT and other import changes (such as excise duties on certain goods, like alcohol and tobacco). Neither does it detail licensing or other restrictions, such as anti-dumping controls. You can search the new Tariff using an 8-digit commodity code, a production description or a combination of the two things.
https://www.gov.uk/guidance/uk-tariffs-from-1-january-2021
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