A man assumes that a woman's refusal is just part of a game. Or, at any rate, a lot of men assume that. When a man says no, it's no. When a woman says no, it's yes, or at least maybe. There is even a joke to that effect. And little by little, women begin to believe in this view of themselves.
Britain is economically very closely integrated with its European partner countries. Were these ties to be cut, it would be a huge step backwards for the country and would weaken it considerably. In the era of globalisation, "splendid isolation" is not a smart option.