I decided to go and buy some more anyway as I didn't want my brew ruined. Making some IPA, from a Brewmaker kit - not quite at the separate ingredients stage yet!!! Wasn't a wasted trip though as when I was there I remembered that I wanted - no, needed - a few other goodies. Have never used champagne yeast for cider - only ever for sparkling wine. I use Youngs general purpose yeast for cider usually but I'll go back to the brew shop when it's nearly done and give it a go