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Found this about the difference for fuse rating, may be of some interest for all but mostly for the US guys as you will the way fuses ( I believe it's more centralize now) are different. I also made a chart to keep in my driver's manual if you wish to print it.
All glass fuses come in 2 types fast blow and slow blow.
My understanding is that the USA rating system is the maximum amperage the fuse will hold continuously. The British rating system tells us the amperage at which the fuse will blow *instantly*.
Perhaps we're saying the same thing, differently?
Slow blow fuses have some sort of coiled interior visible where as fast blow usually have a single wire.
These are dual element glass fuses such a MDQ, MDL, MDA, and GDL. I don't think I've seen dual element fuses in automotive applications. But every day I see something new, it seems!