Don't get me wrong, Brexit was a bad thing. My reply is strictly about things that are made by large companies outside of Europe. Skip any of those qualifiers and things change.
Generally it’s individuals and small to medium sized companies both inside and outside the UK that are negatively affected by Brexit.
Not even sure if the UK has changed this already.
https://www.trade-tariff.service.gov.uk/headings/8525
The distinction in law between sub-30 and 30+ minutes still exists, inherited from EU law, but the tariff is 0% in both cases:
https://www.gov.uk/guidance/classifying-electrical-equipment...
Summary of the changes from the "Common External Tariff" of the EU to the "UK Global Tariff":
"The net effect of the tariff regime according to a summary by the Department for International Trade is as follows:
- 47% of products will be tariff-free, compared to 27% under the CET and
- Average tariffs will be reduced from 7.2% under the CET to 5.7% under the UKGT
This is achieved through changes to rates of tariff by lowering rates, reducing rates to zero or rounding rates down."