I wish that I could give them 0 stars.
I was attracted by the green energy label and they offered about 50% reduction in bills compared to British gas. By the time I left, I was paying double of what I used to pay BG.
To add insult to injury, despite being given sufficient notice about the leaving day and the current resident signing up to another provider (yes, I warned her about these cowboys), bulb decided to charge another 14 days.
Avoid bulb like the plague. You've been warned.