To ensure IPO services operate smoothly, maintenance to our IT systems is required.
As a result of the latest work customers will experience disruption to the IPO’s new service to search and classify trade mark goods and services. While essential work takes place the service will be unavailable from 6 January 2021.

Alternative services are available. Customers can make use of the Nice trade mark classification system that groups together similar goods or services into 45 different classes. They can also make use of the TMClass classification search tool.

We will update customers once maintenance to the UK classification system is completed.

https://www.gov.uk/government/news/it-maintenance-disrupts-ipo-service-to-search-and-classify-trade-mark-goods-and-services
Content Reproduced verbatim from the Website of the United Kingdom Intellectual Property Office (UKIPO) as permitted under their Terms of Use.