The following was posted on the Coopers forums in response to a query about what the codes on Coopers Yeast sachets included in their kits mean. While it doesn't give the exact details of the yeast(s) varieties involved (which Coopers won't release, and change over time anyway), it's useful to know if you have some surplus yeast sachets and want to know how old they are, and what brews they are suitable for.
[T]o extend the inital listing to include yeast sachet codes if they were packaged today being the 268th day of 2007:
Original Series:- A (26807)
International Series:-
Australian Pale Ale - A+L (26807 PA)
Mexican Cerveza - A+L (26807 MC)
Bavarian Lager - L (26807 P)
Canadian Blonde - A (26807)
Brewmaster Selection:-
Wheat - A (26807 W)
IPA - A (26807 IPA)
Irish Stout - A (26807 IS)
Pilsener - L (26807 P)
Premium Selection:- A+L (26807 PS)
Note: A = ale yeast and L = lager yeast