Not all fuses are equal Trev, just do a bit of research instead of detracting in your usual style mate. There's tests on the internet showing that the fuses in those packs of 100 for £5 or whatever are particularly nasty, the 5,10 and 15A tested exactly all the same and other times a 5A fuse has carried 20A for minutes, not a fraction of a second life it should.
I guess 99% of all the fuses (like most things these days) are made in China but China will be making good ones AND bad ones.
A good quality fuse often has the fuse rating clearly on the side usually in white lettering, like these from Halfords.
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Halfords have a responsibility under law for the stuff they sell and I don't think they'll be leaving themselves open to litigation from selling shite dangerous fuses after someone's car catches fire.
I previously purchased a cheap multi pack from eBay and threw them away after testing a few myself. They were rubbish and the value was simply embossed into the end and hard to read like this cheap eBay set of 50 for £4.99.
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When you say "you pay more" how much more exactly? I don't like over paying myself but It's pennies Trev and simply Not worth the risk.