whisky-dave wrote:

But according to regulations in the UK on changing fuses it should be either a 3A for below 720W or a 13amp for above 720W .

https://www.rospa.com/home-safety/uk...hoosing-fuses/

ROSPA doesn't represent "regulations", it's just advice, based on the
ratings of fuses they expect people to have at hand, and even that page
suggests 5A for some appliances ...