Hi Mate,
I recently made a GB and got the same smell, posted it on here a few weeks ago. It has improved over time and is now drinkable but not completly gone. A few more weeks should see it through.
I was told by a winemaking buddy that it was due to poor temp control - did you keep an eye on the temp? I'm not sure and think it may be the kit I used, also that artifical sugar taste isn't great so my next GB will be without a kit, do a search on here there are some good GB recipies that don't require the kit.
Anyway bottle it and cross your fingers it's ok by Chrissie, if not just get everyone pissed first then serve it up
Cheers
Ash