Looking for that elusive bigirl for a party on 19 Apr in London

I know this is always a long-shot, but I have a meet arranged in central London with a wonderful, sexy looking couple on 19 Apr. She is bisexual and is very keen that I bring a girl (as am I)! I would love to hear from single girls or couples with bi females (both are invited). I am a clean, attractive, professional male with a naughty adventurous streak and very happy to meet beforehand. Let me know what you think. J