Mark - I think it pretty much still is 'current' (pun intended). The point of a fuse is that it is 'blowable'. That it blows means you've been protected. It's been a long, long time (i.e. can't remember) since I had one go.

If one goes, you replace it. If it quickly goes again, check your appliance, there's probably something wrong. If it doesn't blow again, eh, just one of those things. Especially if it's 13A.