Now I'm certainly no expert but for what it's worth, you need to be very careful with fuses as my understanding is that fuses are now rated by their CCR that is their constant current rating thus an old type 35amp fuse which would blow over 35amps will now blow at something like 70amps so if you have any old 50 amp fuses like cars in the '60's had, then they would only blow at 100 amps but the car would probably be on fire by then.
Please correct me if I have miss understood what I read recently.
Probably something in that Reg. I seem to recall seeing fuses with a paper insert which said 25A continuous, 35A blow. I might even still have some...…..I'll look later.
Maybe 25A would be a better modern fuse if that's true.