public FakeShippingMethodRepository()
        {
            var factory = new Factory(null);

            _shippingZones = new List<ShippingZone> {
                factory.CreateShippingZone("UK", "UK"),
                factory.CreateShippingZone("Rest Of World", "ROW")
            };

            _shippingMethods = new List<ShippingMethod> {
                factory.CreateShippingMethod("UK Standard", "UKS", _shippingZones[0], 5.00M),
                factory.CreateShippingMethod("UK Next Day", "UKND", _shippingZones[0], 10.00M),
                factory.CreateShippingMethod("Europe", "EUR", _shippingZones[1], 15.00M)
            };
        }