Fuses

UK vs USA - ISOA¹ Tech Tips

Heralds prior to 13/60 was not fitted with fuses. Except 1200's exported to the US.
However it's not that complicated to add fuses yourself.
One way would be to use inline fuses(see pic.) wherever desirable.
Another would be to take a Standard Triumph approach and do it like it is done for the Spitfire MkIII including the use of a fusebox.

Inline glass cartridge fuse holders	Fuse Box

Footnotes

1. ISOA