It's sat in a box for six months as I've been too scared to use it.
The instructions aren't great (it says turn the knob anti-clockwise to the closed position, but this position has an open lid illustrated on it). 
I've cooked a stew and it started hissing so I've just run in the kitchen, quickly turned the gas off and closed the door.
I've been reading about them and I think this photo (not my kitchen!) is why it's stayed in the box so long!
I'm a wimp aren't I? 