In the UK All fire insurance assessors are trained to investigate any and all self or badly implemented alterations to a house electrical system no matter how small that do not comply to building regulations or equipment manufacturers specifications. If an investigator reports that a fire or electrical incident occurred in the following scenario an insurance company will invariably invalidate your claim for Your Amp Your fire damaged room or your House.
Replacing a BS 1362 regulated fuse with anything else Audiophile or otherwise is just the same as soldering a section of wire into your equipments mains inlet
http://www.fatallyflawed.org.uk/BS1363/DTI_warning_on_Counterfeit_Fuses_web.pdf