Funny, but …
As for which way round to fit it, Jason Gould advises as follows:
“If the kite safety mark is embossed on the edge of the of the fuse’s conductive cap the fuse value should point towards the bottom of the fuse holder. Should the kite mark be embossed on the very end of the fuse’s cap then the fuse value should face the top of the fuse holder”.
From the Naim fuse FAQ: Equipment Fuses