My son was at Dulwich Montessori on College Road, and I would highly recommend it. It is such a caring envirnoment, it is a real home from home, the teachers are wonderful and it is a proper Montessori unlike some others in the area. My daughter will be starting there next year! I also heard lots of good things about their sister nursery Dulwich Oaks Montessori, it has a massive garden, so worth looking at both.