I recently bought a Woodfords Wherry starter kit off ebay from Homebrew online. I have to say I'm mostly happy so far. I seem to have done something wrong though - I'm new to beer but I've done some wine fermenting. I put the wherry in the airing cupboard to keep it warm but I'm worried the temperature may have been too high at 26 C. The fermentation was quite vigorous to start with but then stopped after 24 hours. I've now taken it out of the airing cupboard - searching online says I need 18-22 C for beer. Have I killed the yeast though? and if so will adding more yeast
a) do any harm or
b) start the fermentation again?