A typical breaker won’t blow instantly when you exceed the rated current either (unless you exceed it by a lot — like at least 5x). At less than double the rate

A typical breaker won’t blow instantly when you exceed the rated current either (unless you exceed it by a lot — like at least 5x). At less than double the rated current you could be waiting several minutes. So it’s not just a UK fuse issue. This isn’t really an issue. “Hot enough to concern you” is undesirable but not really what they’re worried about so much as “hot enough to combust”. And the alternative—if it were to blow instantly—is that your fuses would blow any time you turned something on with a high inrush current like a stand mixer or a vacuum cleaner.