The power plug on my grinder does not fit the outlet
Moccamaster grinders are supplied with an international EU plug (type C), which also fits the UK type G socket. Two-wire class II appliances, such as the Moccamaster grinders, are not earthed. They often have a plastic grounding pin which only serves to open the shutters of the outlet.
The lack of such an earth pin on a type C plug makes it a bit more difficult to connect it to a type G receptacle, but it will fit into the socket. (In some cases it will only fit by sticking an object into the centre hole of the power outlet, which opens up the two other holes)