I used Community Fibre for 2 years and they proved reliable. The customer service is great. They always helped me with my questions and provided useful information and advice.
They offer high interest speed at a good price, which unfortunately is pretty rare in London.
It’s sad to leave them as I am moving to an area where they don’t have the infrastructure just yet, but I will move back to them as soon as they announce their infrastructure is ready in the area.