The metric system is used worldwide (SI system) with a few exceptions. Not just in the UK.
From Wikipedia: "...., a total of seven countries had not "adopted the metric system as their exclusive system of measurement". They are: Federated States of Micronesia, Liberia, Marshall Islands, Myanmar, Palau, Samoa and the United States"
The UK is using the metric system, though the imperial units are also being used, unofficially.
True utility products are generally found worldwide.
Regarding the UK, there are situations where a locking blade is allowed