Log in to the official British trademark and patent website: https://www.gov.uk/search-for-trademark. There are three ways to search for trademarks: trademark number; owner; keyword and phrase search. Trademark number search: You can choose from four options: "British Trademark", "EU", "EU International Trademark", and "British International Trademark". You need to enter the trademark number here. Owner's trademark search: British trademark search only, search can be conducted based on the owner's name and postal code. Keyword and phrase query: British trademark keyword and phrase query can be searched based on keywords, short words, trademark type, registration type and registration time.