No, your log-in data (email address and password) are only valid for the domain on which you have registered. If you want to order from another country as a registered customer it is necessary to create another customer account before. Example: You have registered on sifjakobs.com as a customer and now you want to place an order from sifjakobs.uk. In this case you cannot use your log-in data for sifjakobs.com but you have to create a new customer account for sifjakobs.uk.