I need students to learn English in London

I am a British teacher with lots of experience. When I was abroad it was easy, people told their friends and I soon had too much work. Here in London, it's so difficult. I have experience with groups but I'm down to one student per level and I don't like 1 to 1! Nor do students. They want to practise with a peer. All my materials involve activities, role plays and games. Where and how can I find students to come and learn with me?