Hello, I'm going to be visiting London this upcoming weekend, and I'm looking for a nice, upscale restaurant with good vegetarian options. I am taking a good friend and her husband out for her birthday, so I'm prepared to spend up to 80 pounds per person for a great meal. She is a vegetarian, so I'd like to eat somewhere that has some great offerings for her - but it doesn't have to be an only vegetarian restaurant. The atmosphere has to be nice, and we'll be sitting around catching up for quite a while, so we don't want to be rushed. Any ethnicity of cuisine would be fine. Anywhere in central London would be fine for a location. Thank you very much for your recommendations!