Dry humor is the handshake
Wit, irony and self-deprecation are how British women test for confidence. A man who can laugh at himself signals security; a man who lists his income, his square footage or his car signals the opposite, and the British word for it - flashy - is not a compliment. Keep the conversation on culture, career, ideas and honest questions about her life, and let the humor stay lightly understated rather than performed.