The UK power grid is one of the oldest in the world and was built before the use of fuse/breaker panels were standardized.
While fuse panels are mandatory in the UK now, in order to ensure safety with older electrical setups UK plugs have built-in fuses which is why they are so large and you can open them up.
While this started as a workaround to a problem it has the benefit that UK plugs are the safest in concept because of the extra protection.
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