How can I locate an electrical fault?
The first thing to do is positively verify what is and what is not working. Plug the appliances in elsewhere to make sure the appliances are working. Plug in a known working lamp (or other simple device like a drill or a mixer) to every socket in the kitchen to test them. BTW, usually outlets are fused, not individual sockets in the outlet.

Let's assume that two of the outlets, both having two sockets, are completely off, having no power, and no circuit breakers are tripped. You write "fuse board". Do you really have fuses, not circuit breakers? This would have to be a very old house for that to be the case.

If you have two outlets without power and no tripped breakers, that is very bad because it indicates a potential wiring problem inside the walls. In this case I would strongly recommend getting an electrician, because you may be at risk of a fire and if there is a problem with old wiring in the walls, you will not be able to fix it yourself.