I was given a basic "Irish Red" starter kit (containing a packet of Lallemand Nottingham Ale yeast) for Christmas but have just got around to opening and reading the instructions. It seems that I should have kept the yeast in a cool place (i.e. fridge) but, unfortunately, it's been stored in a location that can get quite warm (high 60's/early 70's). Should I just buy a new packet or is what I have still usable?
Thanks in advance.