It's all gone sour!

[melbouch]

We have just brewed our first kit which was a Coopers Bitter. Everything went well and made a passable beer which got better and better over a 3 week period. But now it smells horrible and tates sour and gone off. We sterilised thoroughly using Milton fluid which was recommended by the woman who runs our local homebrew shop and followed all instructions to the letter. Any ideas?

[PureGuiness]

Did you get any air into it at any point? If it's in a keg and the pressure has dropped and you've had the dreaded glug then that may have oxidised the beer. That's the only thing I can think of -especially as you said it was drinkable and getting better.

[melbouch]

I'll look into that ta!