Read the Wattage plate on the GHDs - and assuming you are in 240V land then...
13A will work up to 3kW Far too big but it will work
10A will work up to 2.4kW Ditto
5A will work up to 1.2kW This one
3A will work up to 720W Or this one
1A will work up to 240W Probably not this one but maybe
Do not panic too much about fitting the correct sized fuse - use what's available and fit the one required as soon as you reasonably can.
Peccavi, July 2010