I was expecting to have to pour it down the drain, but i took the lid off and it smelt ok, so I took a sip and it tasted ok, so I've just kegged and carbonated it abd its a fine beer. I'm not saying it's the best stout I've ever had but I can't detect anything wrong with it at all.
I know stout is not exactly the beer you would choose to do this experiment with but It's been sat at room temperature for five months (through the heat wave) and it's fine.

