Ok, feel free to point and laugh at this...
Just put a new brew on last night. It's only a kit as I'm quite new to this. But is Coopers Dark + 1kg Brew Enhancer.
Anyway, got it going, but thought it was cold in my house so popped a bru-belt heater belt on. Went out today and when I got discovered it was seriously bubbling out of the top of the (closed) brew bucket. It's distorted the top of my bucket and I had to open it to release the pressure. I've taken the belt off and it seemed to be quite warm. Have I totally buggered up this batch?