The Intellectual Property Office has an online resource to assist people in finding the Goods and/or Services that would be acceptable as part of a UK Trade Mark Application. The IPO advises that, when applying to register a Trade Mark, you must use the classification system to specify the Goods and/or Services you wish to protect.
The service, which can be found on the website of The IPO, recommends that one considers:
what people pay you for;
what goods you sell, or are intending to sell in the future, under the Mark; or
what services your offer, or intend to offer, under the Mark.
Further help can be found here – https://www.search-uk-trade-mark-classes.service.gov.uk/searchclasses